FILE A variety of packaging solutions exist for products that must be kept within a specific temperature range.

Cold chain distribution is particularly useful in the food and pharmaceutical industries. A packaging company strives to maintain a constant temperature for its packages. It is believed that the temperature of its packages follows a normal distribution with a mean of 5 degrees Celsius and a standard deviation of 0.3 degree Celsius. Inspectors take weekly samples for 5 weeks of eight randomly selected boxes and report the following temperatures in degrees Celsius. A portion of the data are given below; the complete data, labeled Packaging, are available on the text website. L056

a. Construct an chart for quality control. Plot th e five weekly sam ple m eans on the chart.

b. Are any points outside the control limits? Does it appear that the process is in control? Explain.

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Week 1 Week 2 Week 3 Week 4 Week 5 3.98 5.52 5.79 3.98 5.14 4.99 5.52 6.42 5.79 6.25 4.95 4.95 5.44 5.95 4.28