Nothing
selftest.stats.tck <- function(){
options(guiToolkit="tcltk")
w <- gwindow(title = "Parameters and Statistics")
size(w) <- c(700, 900)
g <- ggroup(container=w, horizontal=FALSE, use.scrollwindow = TRUE)
#------------- Question 1 -----------#
gp1 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp1.1 <- ggroup(container = gp1, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("1) ", container = gp1.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Which describes the expected value of a discrete random variable X?", container = gp1.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans1 <- c("(a) E(X) = \u2211\u2093 xf(x).",
"(b) The arithmetic mean given all possible outcomes from X.",
"(c) E(X) = \u2211\u2093 f(x).",
"(d) (a) and (b) only.",
"(e) (b) and (c) only.")
f1 <- function(h,....){
if(tail(svalue(r1),1) == ans1[1]){
gmessage(msg="Partially correct", icon = "error")
}
if(tail(svalue(r1),1)== ans1[2]){
gmessage(msg="Partially correct", icon = "error")
}
if(tail(svalue(r1),1)== ans1[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r1),1)== ans1[4]){
gmessage(msg="Correct")
}
if(tail(svalue(r1),1)== ans1[5]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r1) <- character(0)
}
r1 <- gcheckboxgroup(ans1, container = gp1, checked = FALSE, where = "beginning", handler = f1)
#------------- Question 2 -----------#
gp2 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp2.1 <- ggroup(container = gp2, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("2) ", container = gp2.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("The variance of a random variable X is computed as:", container = gp2.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans2 <- c("(a) Var(X) = E(X\u00B2) - E(X)\u00B2.",
"(b) Var(X) = E(X)\u00B2 - E(X\u00B2).",
"(c) Var(X) = E(X\u00B2) + E(X)\u00B2.",
"(d) Var(X) = E(X)\u00B2 + E(X\u00B2).")
f2 <- function(h,....){
if(tail(svalue(r2),1) == ans2[1]){
gmessage(msg="Correct")
}
if(tail(svalue(r2),1)== ans2[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r2),1)== ans2[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r2),1)== ans2[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r2) <- character(0)
}
r2 <- gcheckboxgroup(ans2, container = gp2, checked = FALSE, where = "beginning", handler = f2)
#------------- Question 3 -----------#
gp3 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp3.1 <- ggroup(container = gp3, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("3) ", container = gp3.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("For a random variable X, assume that f(x) = 0.5(x/4) for x = 1, 3, and 4, and that f(x) = 0 for all \n other x outcomes. What is E(X)?",
container = gp3.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans3 <- c("(a) 1",
"(b) 3.25",
"(c) 2.5",
"(d) 0")
f3 <- function(h,....){
if(tail(svalue(r3),1) == ans3[1]){
gmessage(msg="Incorrect. Make a table of probabilities for x outcomes and try again.", icon = "error")
}
if(tail(svalue(r3),1)== ans3[2]){
gmessage(msg="Correct")
}
if(tail(svalue(r3),1)== ans3[3]){
gmessage(msg="Incorrect. Make a table of probabilities for x outcomes and try again.", icon = "error")
}
if(tail(svalue(r3),1)== ans3[4]){
gmessage(msg="Incorrect. Make a table of probabilities for x outcomes and try again.", icon = "error")
}
svalue(r3) <- character(0)
}
r3 <- gcheckboxgroup(ans3, container = gp3, checked = FALSE, where = "beginning", handler = f3)
#------------- Question 4 -----------#
gp4 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp4.1 <- ggroup(container = gp4, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("4) ", container = gp4.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("For the pdf in question 3, what is E(X\u00B2)?",
container = gp4.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans4 <- c("(a) 1",
"(b) 3.25",
"(c) 11.5",
"(d) 42.25")
f4 <- function(h,....){
if(tail(svalue(r4),1) == ans4[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r4),1)== ans4[2]){
gmessage(msg="Incorrect. This is E(X)", icon = "error")
}
if(tail(svalue(r4),1)== ans4[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r4),1)== ans4[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r4) <- character(0)
}
r4 <- gcheckboxgroup(ans4, container = gp4, checked = FALSE, where = "beginning", handler = f4)
#------------- Question 5 -----------#
gp5 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp5.1 <- ggroup(container = gp5, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("5) ", container = gp5.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("For the pdf in question 3, what is Var(X)?",
container = gp5.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans5 <- c("(a) 0.9375",
"(b) 1",
"(c) 20.75",
"(d) \u221E")
f5 <- function(h,....){
if(tail(svalue(r5),1) == ans5[1]){
gmessage(msg="Correct")
}
if(tail(svalue(r5),1)== ans5[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r5),1)== ans5[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r5),1)== ans5[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r5) <- character(0)
}
r5 <- gcheckboxgroup(ans5, container = gp5, checked = FALSE, where = "beginning", handler = f5)
#------------- Question 6 -----------#
gp6 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp6.1 <- ggroup(container = gp6, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("6) ", container = gp6.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("The efficacy of a statistical estimator can be quantified using its...", container = gp6.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans6 <- c("(a) stress.",
"(b) bias.",
"(c) consistency.",
"(d) efficiency.",
"(e) all but (a) are correct")
f6 <- function(h,....){
if(tail(svalue(r6),1) == ans6[1]){
gmessage(msg="Incorrect",icon="error")
}
if(tail(svalue(r6),1)== ans6[2]){
gmessage(msg="Partially correct. Bias is an important characteristic to consider in estimators.",icon="error")
}
if(tail(svalue(r6),1)== ans6[3]){
gmessage(msg="Partially correct. Consistency is an important characteristic to consider in estimators.",icon="error")
}
if(tail(svalue(r6),1)== ans6[4]){
gmessage(msg="Partially correct. Efficiency is an important characteristic to consider in estimators.", icon = "error")
}
if(tail(svalue(r6),1)== ans6[5]){
gmessage(msg="Correct")
}
svalue(r6) <- character(0)
}
r6 <- gcheckboxgroup(ans6, container = gp6, checked = FALSE, where = "beginning", handler = f6)
#------------- Question 7 -----------#
gp7 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp7.1 <- ggroup(container = gp7, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("7) ", container = gp7.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("From a random variable Y we observe the outcomes: y\u2081, y\u2082,...,y\u2099. Then, \u0233 = 7 is a(n)", container = gp7.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans7 <- c("(a) parameter.",
"(b) statistic.",
"(c) estimator.",
"(d) estimate.",
"(e) (b) and (d) above.",
"(f) (b) and (c) above.")
f7 <- function(h,....){
if(tail(svalue(r7),1) == ans7[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r7),1)== ans7[2]){
gmessage(msg="Partially correct", icon = "error")
}
if(tail(svalue(r7),1)== ans7[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r7),1)== ans7[4]){
gmessage(msg="Partially correct", icon = "error")
}
if(tail(svalue(r7),1)== ans7[5]){
gmessage(msg="Correct")
}
if(tail(svalue(r7),1)== ans7[6]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r7) <- character(0)
}
r7 <- gcheckboxgroup(ans7, container = gp7, checked = FALSE, where = "beginning", handler = f7)
#------------- Question 8 -----------#
gp8 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp8.1 <- ggroup(container = gp8, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("8) ", container = gp8.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <-glabel("From a random variable Y we observe the outcomes: y\u2081, y\u2082,...,y\u2099. Then, \u0232 is a(n)", container = gp8.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans8 <- c("(a) parameter.",
"(b) statistic.",
"(c) estimator.",
"(d) estimate.",
"(e) (b) and (d) above.",
"(f) (b) and (c) above.")
f8 <- function(h,....){
if(tail(svalue(r8),1) == ans8[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r8),1)== ans8[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r8),1)== ans8[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r8),1)== ans8[4]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r8),1)== ans8[5]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r8),1)== ans8[6]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r8) <- character(0)
}
r8 <- gcheckboxgroup(ans8, container = gp8, checked = FALSE, where = "beginning", handler = f8)
#------------- Question 9 -----------#
gp9 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp9.1 <- ggroup(container = gp9, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("9) ", container = gp9.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("From a random variable Y we observe the outcomes: y\u2081, y\u2082,...,y\u2099. Then, Var(Y) is a(n)", container = gp9.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans9 <- c("(a) parameter.",
"(b) statistic.",
"(c) estimator.",
"(d) estimate.",
"(e) (b) and (d) above.",
"(f) (b) and (c) above.")
f9 <- function(h,....){
if(tail(svalue(r9),1) == ans9[1]){
gmessage(msg="Correct")
}
if(tail(svalue(r9),1)== ans9[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r9),1)== ans9[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r9),1)== ans9[4]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r9),1)== ans9[5]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r9),1)== ans9[6]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r9) <- character(0)
}
r9 <- gcheckboxgroup(ans9, container = gp9, checked = FALSE, where = "beginning", handler = f9)
#------------- Question 10 -----------#
gp10 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp10.1 <- ggroup(container = gp10, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("10) ", container = gp10.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("I want to find the mean growth rates given a series of rates. I would use the:", container = gp10.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans10 <- c("(a) arithmetic mean.",
"(b) geometric mean",
"(c) harmonic mean",
"(d) sample median")
f10 <- function(h,....){
if(tail(svalue(r10),1) == ans10[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r10),1)== ans10[2]){
gmessage(msg="Correct")
}
if(tail(svalue(r10),1)== ans10[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r10),1)== ans10[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r10) <- character(0)
}
r10 <- gcheckboxgroup(ans10, container = gp10, checked = FALSE, where = "beginning", handler = f10)
#------------- Question 11 -----------#
gp11 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp11.1 <- ggroup(container = gp11, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("11) ", container = gp11.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("I want a location estimator that is robust to outliers. A widely used option is the:", container = gp11.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans11 <- c("(a) arithmetic mean.",
"(b) geometric mean",
"(c) harmonic mean",
"(d) sample median")
f11 <- function(h,....){
if(tail(svalue(r11),1) == ans11[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r11),1)== ans11[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r11),1)== ans11[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r11),1)== ans11[4]){
gmessage(msg="Correct")
}
svalue(r11) <- character(0)
}
r11 <- gcheckboxgroup(ans11, container = gp11, checked = FALSE, where = "beginning", handler = f11)
#------------- Question 12 -----------#
gp12 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp12.1 <- ggroup(container = gp12, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("12) ", container = gp12.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("I obtain a random sample of four male ISU students and measure their height. \nThe measures (in meters) are: 2, 1.85, 1.85, and 1.7. \nWhat is arithmetic mean of these data?", container = gp12.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans12 <- c("1.5m",
"1.75m",
"1.85m",
"1.95m")
f12 <- function(h,....){
if(tail(svalue(r12),1) == ans12[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r12),1)== ans12[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r12),1)== ans12[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r12),1)== ans12[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r12) <- character(0)
}
r12 <- gcheckboxgroup(ans12, container = gp12, checked = FALSE, where = "beginning", handler = f12)
#------------- Question 13 -----------#
gp13 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp13.1 <- ggroup(container = gp13, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("13) ", container = gp13.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("What is the sample median of the data in Question 12?", container = gp13.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans13 <- c("1.5m",
"1.75m",
"1.85m",
"1.95m")
f13 <- function(h,....){
if(tail(svalue(r13),1) == ans13[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r13),1)== ans13[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r13),1)== ans13[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r13),1)== ans13[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r13) <- character(0)
}
r13 <- gcheckboxgroup(ans13, container = gp13, checked = FALSE, where = "beginning", handler = f13)
#------------- Question 14 -----------#
gp14 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp14.1 <- ggroup(container = gp14, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("14) ", container = gp14.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("What is the sample variance of the data in Question 12?", container = gp14.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans14 <- c("0.015m",
"0.015m\u00B2",
"1.22m",
"1.22m\u00B2")
f14 <- function(h,....){
if(tail(svalue(r14),1) == ans14[1]){
gmessage(msg="Incorrect. The units are wrong.", icon = "error")
}
if(tail(svalue(r14),1)== ans14[2]){
gmessage(msg="Correct")
}
if(tail(svalue(r14),1)== ans14[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r14),1)== ans14[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r14) <- character(0)
}
r14 <- gcheckboxgroup(ans14, container = gp14, checked = FALSE, where = "beginning", handler = f14)
#------------- Question 15 -----------#
gp15 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp15.1 <- ggroup(container = gp15, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("15) ", container = gp15.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("What is the sample standard deviation of the data in Question 12?", container = gp15.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans15 <- c("0.015m",
"0.015m\u00B2",
"1.22m",
"1.22m\u00B2")
f15 <- function(h,....){
if(tail(svalue(r15),1) == ans15[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r15),1)== ans15[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r15),1)== ans15[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r15),1)== ans15[4]){
gmessage(msg="Incorrect. The units are wrong.", icon = "error")
}
svalue(r15) <- character(0)
}
r15 <- gcheckboxgroup(ans15, container = gp15, checked = FALSE, where = "beginning", handler = f15)
#------------- Question 16 -----------#
gp16 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp16.1 <- ggroup(container = gp16, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("16) ", container = gp16.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("(T or F) If a sample includes the entire population, \nthen statistics serve a descriptive instead of an inferential purpose. ", container = gp16.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans16 <- c("True",
"False")
f16 <- function(h,....){
if(tail(svalue(r16),1) == ans16[1]){
gmessage(msg="Correct")
}
if(tail(svalue(r16),1)== ans16[2]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r16) <- character(0)
}
r16 <- gcheckboxgroup(ans16, container = gp16, checked = FALSE, where = "beginning", handler = f16)
}
#############################################################################
#############################################################################
selftest.stats.tck1 <- function(){
options(guiToolkit="tcltk")
w <- gwindow(title = "Transformations of random variables")
size(w) <- c(700, 600)
g <- ggroup(container=w, horizontal=FALSE, use.scrollwindow = TRUE)
#------------- Question 1 -----------#
gp1 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp1.1 <- ggroup(container = gp1, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("1) ", container = gp1.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Assume that a random variable X has the expected value, E(X) = 2. \nTo X, I add 3, then multiply by 2. The new expected value is...",
container = gp1.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans1 <- c("(a) 7",
"(b) 12",
"(c) 10",
"(d) 8")
f1 <- function(h,....){
if(tail(svalue(r1),1) == ans1[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r1),1)== ans1[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r1),1)== ans1[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r1),1)== ans1[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r1) <- character(0)
}
r1 <- gcheckboxgroup(ans1, container = gp1, checked = FALSE, where = "beginning", handler = f1)
#------------- Question 2 -----------#
gp2 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp2.1 <- ggroup(container = gp2, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("2) ", container = gp2.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Assume that a random variable X has the variance, Var(X) = 2. \nTo X, I add 3, then multiply by 2. The new population variance is...",
container = gp2.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans2 <- c("(a) 7",
"(b) 12",
"(c) 10",
"(d) 8")
f2 <- function(h,....){
if(tail(svalue(r2),1) == ans2[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r2),1)== ans2[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r2),1)== ans2[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r2),1)== ans2[4]){
gmessage(msg="Correct")
}
svalue(r2) <- character(0)
}
r2 <- gcheckboxgroup(ans2, container = gp2, checked = FALSE, where = "beginning", handler = f2)
#------------- Question 3 -----------#
gp3 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp3.1 <- ggroup(container = gp3, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("3) ", container = gp3.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("(T or F) The sum of two normal random variables is an exponential distribution.", container = gp3.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans3 <- c("True",
"False")
f3 <- function(h,....){
if(tail(svalue(r3),1) == ans3[1]){
gmessage(msg="Incorrect. The sum of two normal random variables will also be normal.", icon = "error")
}
if(tail(svalue(r3),1)== ans3[2]){
gmessage(msg="Correct. The sum of two normal random variables will also be normal.")
}
svalue(r3) <- character(0)
}
r3 <- gcheckboxgroup(ans3, container = gp3, checked = FALSE, where = "beginning", handler = f3)
#------------- Question 4 -----------#
gp4 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp4.1 <- ggroup(container = gp4, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("4) ", container = gp4.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Assume that X ~ N(0, 2), Y ~ N(2, 4), and Z = X - Y. What is E(Z)?",
container = gp4.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans4 <- c("(a) -2",
"(b) 0",
"(c) 2",
"(d) 6")
f4 <- function(h,....){
if(tail(svalue(r4),1) == ans4[1]){
gmessage(msg="Correct")
}
if(tail(svalue(r4),1)== ans4[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r4),1)== ans4[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r4),1)== ans4[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r4) <- character(0)
}
r4 <- gcheckboxgroup(ans4, container = gp4, checked = FALSE, where = "beginning", handler = f4)
#------------- Question 5 -----------#
gp5 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp5.1 <- ggroup(container = gp5, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("5) ", container = gp5.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Assume that X ~ N(0, 2), Y ~ N(2, 4), and Z = X - Y. What is Var(Z)? \nAssume that X and Y are independent",
container = gp5.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans5 <- c("(a) -2",
"(b) 0",
"(c) 2",
"(d) 6")
f5 <- function(h,....){
if(tail(svalue(r5),1) == ans5[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r5),1)== ans5[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r5),1)== ans5[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r5),1)== ans5[4]){
gmessage(msg="Correct")
}
svalue(r5) <- character(0)
}
r5 <- gcheckboxgroup(ans5, container = gp5, checked = FALSE, where = "beginning", handler = f5)
#------------- Question 6 -----------#
gp6 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp6.1 <- ggroup(container = gp6, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("6) ", container = gp6.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Let X ~ N(0, 2), Y ~ N(2, 4), Z = X - Y, and assume X and Y are independent. Then,",
container = gp6.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans6 <- c("(a) Cov(X,Y) = 0",
"(b) Cov(X,Y) < 0",
"(c) Cov(X,Y) > 0",
"(d) Cov(X,Y) is undefined")
f6 <- function(h,....){
if(tail(svalue(r6),1) == ans6[1]){
gmessage(msg="Correct. If X and Y are independent, their covariance will equal 0.")
}
if(tail(svalue(r6),1)== ans6[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r6),1)== ans6[3]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r6),1)== ans6[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r6) <- character(0)
}
r6 <- gcheckboxgroup(ans6, container = gp6, checked = FALSE, where = "beginning", handler = f6)
#------------- Question 7 -----------#
gp7 <- gframe(container = g, spacing = 2, pos = 0, horizontal = FALSE)
gp7.1 <- ggroup(container = gp7, spacing = 2, pos = 0, horizontal = TRUE)
q <- glabel("7) ", container = gp7.1, horizontal = TRUE)
font(q) <- list(weight = "bold")
qq <- glabel("Let X ~ N(0, 2), Y ~ N(2, 4), Z = X - Y, and assume Cov(X,Y) = 1. What is Var(Z)?",
container = gp7.1, anchor = c(-1,1))
font(qq) <- list(family = "cambria", size = 11)
ans7 <- c("(a) -2",
"(b) 0",
"(c) 4",
"(d) 6")
f7 <- function(h,....){
if(tail(svalue(r7),1) == ans7[1]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r7),1)== ans7[2]){
gmessage(msg="Incorrect", icon = "error")
}
if(tail(svalue(r7),1)== ans7[3]){
gmessage(msg="Correct")
}
if(tail(svalue(r7),1)== ans7[4]){
gmessage(msg="Incorrect", icon = "error")
}
svalue(r7) <- character(0)
}
r7 <- gcheckboxgroup(ans7, container = gp7, checked = FALSE, where = "beginning", handler = f7)
}
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