Questions from Business Statistics

Q: A group of experts has rated your winery’s two best varietals.

A group of experts has rated your winery’s two best varietals. Ratings are on a scale from 1 to 20, with higher numbers being better. The results are shown in Table 10.7.6. a. Is thi...

Q: To understand your competitive position, you have examined the reliability of

To understand your competitive position, you have examined the reliability of your product as well as the reliability of your closest competitor’s product. You have subjected each pr...

Q: Child care is one of life’s necessities for working parents. Monthly

Child care is one of life’s necessities for working parents. Monthly rates per child at a sample of family day care centers in the North Seattle area are shown in Table 10.7.8. The L...

Q: An advertising study interviewed six randomly selected people in each of two

An advertising study interviewed six randomly selected people in each of two cities, recording each person’s level of preference for a new product (Table 10.7.9). a. Is this a paired...

Q: There are two manufacturing processes, old and new, that produce

There are two manufacturing processes, old and new, that produce the same product. The defect rate has been measured for a number of days for each process, resulting in the following summaries (Table...

Q: To help you decide which of your two current suppliers deserves the

To help you decide which of your two current suppliers deserves the larger contract next year, you have rated a random sample of plastic cases from each one. The data are a composite of several measur...

Q: Consider the weights for two samples of candy bars, before and

Consider the weights for two samples of candy bars, before and after intervention, from Table 5.5.4. a. Is this a paired or an unpaired situation? b. Find the 95% confidence interval for the populatio...

Q: Your Detroit division produced 135 defective parts out of the total production

Your Detroit division produced 135 defective parts out of the total production of 983 last week. The Kansas City division produced 104 defectives out of 1,085 produced during the same time period. a....

Q: You are analyzing the results of a consumer survey of a product

You are analyzing the results of a consumer survey of a product, rated on a scale from 1 to 10. For the 130 consumers who described themselves as “outgoing,” the average rating was 8.36, and the stand...

Q: Some of your advertisements seem to get no reaction, as though

Some of your advertisements seem to get no reaction, as though they are being ignored by the public. You have arranged for a study to measure the public’s awareness of your brand before and after view...