case0402: Cognitive Load

In Sleuth2: Data Sets from Ramsey and Schafer's "Statistical Sleuth (2nd Ed)"

Description

Educational researchers randomly assigned 28 ninth-year students in Australia to receive coordinate geometry training in one of two ways: a conventional way and a modified way. After the training, the students were asked to solve a coordinate geometry problem. The time to complete the problem was recorded, but five students in the “conventional” group did not complete the solution in the five minute alloted time.

Usage

case0402

Format

A data frame with 28 observations on the following 3 variables.

Time

the time (in seconds) that the student worked on the problem

Treatmt

factor variable with two levels—"Modified" and "Conventional"

Censor

1 if the individual did not complete the problem in 5 minutes, 0 if they did

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Sweller, J., Chandler, P., Tierney, P. and Cooper, M. (1990). Cognitive Load as a Factor in the Structuring of Technical Material, Journal of Experimental Psychology General 119(2): 176–192.

Examples

str(case0402)
stem(subset(case0402, Treatmt=="Conventional", Time, drop=TRUE))
stem(subset(case0402, Treatmt=="Modified", Time, drop=TRUE))
wilcox.test(Time ~ Treatmt, case0402)

Example output

'data.frame':	28 obs. of  3 variables:
 $ Time   : num  68 70 73 75 77 80 80 132 148 155 ...
 $ Treatmt: Factor w/ 2 levels "Modified","Conventional": 1 1 1 1 1 1 1 1 1 1 ...
 $ Censor : num  0 0 0 0 0 0 0 0 0 0 ...

  The decimal point is 2 digit(s) to the right of the |

  1 | 34
  1 | 5568
  2 | 34
  2 | 7
  3 | 00000


  The decimal point is 2 digit(s) to the right of the |

  0 | 7778888
  1 | 3
  1 | 568
  2 | 011


	Wilcoxon rank sum test with continuity correction

data:  Time by Treatmt
W = 32, p-value = 0.002542
alternative hypothesis: true location shift is not equal to 0

Warning message:
In wilcox.test.default(x = c(68, 70, 73, 75, 77, 80, 80, 132, 148,  :
  cannot compute exact p-value with ties

Sleuth2 documentation built on May 2, 2019, 7:01 a.m.