Question: Tennessee Accessories, Inc. is working to implement new time standards for a particular sewing process in its T-shirt manufacturing facility. This is a very difficult

Tennessee Accessories, Inc. is working to implement new time standards for a particular sewing process in its T-shirt manufacturing facility. This is a very difficult task, however, because the skill of the individual employees and the age of the equipment cause a great deal of variability in the amount of time the process requires. To account for this variability, random time studies were performed at various times during the day with different employees and different machines. An experimental standard time of 6.5 minutes was chosen as an initial hypothesis for the process. The results of the time study are shown in the table.

a. Generate a histogram of the sample data and comment on the normality of the process.
b. Construct a pair of X and MR charts, and comment on the control.
c. Now, use a Box-Cox transformation with optimal Î» to generate a pair of transformed control charts, and comment on the state of control
d. Estimate the mean and standard deviation of the process, along with the percentage of samples that are greater than the experimental standard time.

Sewing Procedure Time Study (min) Day 1 Day 2 Time of Sample Da Time of Sample 8:30 AM 10:00 AM 10:30 AM 11:00 AM 12:00 PM 12:30 PM 1:30 PM 3.26 4.72 10:00 AM 29 10:30 AM 2.03 1.26 1.83 4.79 3.93 1.73 4.78 124 12:00 PM 15.69 12:30 PM 4.11 1:30 PM 45

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