Questions from Engineering Statistics

Q: The following are the numbers of prescriptions filled by two pharmacies over

The following are the numbers of prescriptions filled by two pharmacies over a 20-day period: Use the signed-rank test at the 0.01 level of significance to determine whether the two pharmacies, on a...

Q: Rework Exercise 16.7 by using the signed-rank test

Rework Exercise 16.7 by using the signed-rank test. Exercise 16.7: The following figures give the systolic blood pressure of 16 joggers before and after an 8-kilometer run: Use the sign test at the...

Q: Rework Exercise 16.6 by using the signed-rank test

Rework Exercise 16.6 by using the signed-rank test. Exercise 16.6: Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are being compared in an air-pollution experi...

Q: A cigarette manufacturer claims that the tar content of brand B cigarettes

A cigarette manufacturer claims that the tar content of brand B cigarettes is lower than that of brand A cigarettes. To test this claim, the following determinations of tar content, in milligrams, wer...

Q: Consider the following data taken on subgroups of size 5. The

Consider the following data taken on subgroups of size 5. The data contain 20 averages and ranges on the diameter (in millimeters) of an important component part of an engine. Display ¯X-...

Q: Suppose for Review Exercise 17.2 that the buyer has set

Suppose for Review Exercise 17.2 that the buyer has set specifications for the part. The specifications require that the diameter fall in the range covered by 2.40000 ± 0.0100 mm. What p...

Q: For the situation of Review Exercise 17.2, give numerical

For the situation of Review Exercise 17.2, give numerical estimates of the mean and standard deviation of the diameter for the part being manufactured in the process. Exercise 17.2: Consider the foll...

Q: Consider the data of Table 17.1. Suppose that additional

Consider the data of Table 17.1. Suppose that additional samples of size 5 are taken and tensile strength recorded. The sampling produces the following results (in pounds per square inch). (a) Plot...

Q: Consider an in-control process with mean μ = 25 and

Consider an in-control process with mean μ = 25 and σ = 1.0. Suppose that subgroups of size 5 are used with control limits μ ± 3σ/ √ n, and centerline at μ. Suppose that a shift occurs in the mean, an...

Q: Consider the situation of Example 17.2. The following data

Consider the situation of Example 17.2. The following data are taken on additional samples of size 5. Plot the ¯X - and S-values on the ¯X - and S-charts that were produced wit...