STAT210prob2.32: STAT210prob2.32: Effect of Cool-Down Time on Cell Phone...

In thoree/stat340: Data and functions for BIAS at NMBU

STAT210prob2.32: Effect of Cool-Down Time on Cell Phone Housings

Description

This data contains results from an experiment on the cool-down time for the moulding process of front housings for cell phones. The experiment was conducted using two cool-down times, 10 and 20 seconds. 20 housings were evaluated at each level of cool-down time. All 40 observations in this experiment were run in random order.

Usage

STAT210prob2.32

Format

A data frame with 20 observations (rows) and 2 variables (columns).

	Column name	Data type	Description	Values
[,1]	CoolDown_10	integer	Inspection score for cell phone housings	(1 - 8)
[,2]	CoolDown_20	integer	Inspection score for cell phone housings	(4 - 9)

Details

Front housings for cell phones are manufactured in an injection moulding process. The time the part is allowed to cool in the mould before removal is thought to influence the occurrence of a particularly troublesome cosmetic defect, flow lines, in the finished housing. After manufacturing, the housings are inspected visually and assigned a score between 1 and 10 based on their appearance, with 10 corresponding to a perfect part and 1 corresponding to a completely defective part.

This is data from Exercise 2.32 in Design and Analysis of Experiments, 9th Edition, EMEA Edition.

Source

Montgomery, D. C. (2019) Design and Analysis of Experiments, 9th Edition, EMEA Edition. New York: Wiley.

Examples

# A short summary of the variables
summary(STAT210prob2.32)

# First six and last eight rows
head(STAT210prob2.32)
tail(STAT210prob2.32, n = 8)

thoree/stat340 documentation built on June 30, 2024, 4:04 p.m.