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Chapter 14: Q1CQQ (page 654)
What are process data?
Process data represents the measurement of a variable/characteristic/feature of goods/services that are produced involving equipment, people, material, procedures, and circumstances. It is often measured on a time scale.
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Control Charts for p. In Exercises 5鈥�12, use the given process data to construct a control chart for p. In each case, use the three out-of-control criteria listed near the beginning of this section and determine whether the process is within statistical control. If it is not, identify which of the three out-of-control criteria apply
Smartphone Batteries TheSmartBatt company manufactures batteries for smartphones. Listed below are numbers of defects in batches of 200 batteries randomly selected in each of 12 consecutive days of production. What action should be taken?
5 7 4 6 3 10 10 13 4 15 4 19
Lake Mead Elevations What does the R chart tell us about Lake Mead?
Child Restraint Systems Use the numbers of defective child restraint systems given in Exercise 8. Find the mean, median, and standard deviation. What important characteristic of the sample data is missed if we explore the data using those statistics?
In Exercises 5鈥�8, use the following two control charts that result from testing batches of newly manufactured aircraft altimeters, with 100 in each batch. The original sample values are errors (in feet) obtained when the altimeters are tested in a pressure chamber that simulates an altitude of 6000 ft. The Federal Aviation Administration requires an error of no more than 40 ft at that altitude.
Is the process mean within statistical control? Why or why not?
In Exercises 5鈥�8, use the following two control charts that result from testing batches of newly manufactured aircraft altimeters, with 100 in each batch. The original sample values are errors (in feet) obtained when the altimeters are tested in a pressure chamber that simulates an altitude of 6000 ft. The Federal Aviation Administration requires an error of no more than 40 ft at that altitude.
What is the value of\(\bar R\)? In general, how is a value of\(\bar R\)obtained?
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