A. Calculate the 95% confidence interval for the population mean number of customer contacts for each sales representative.

B. At this confidence level, is it possible to reject the hypothesis that these two representatives call on an equal number of potential clients?

P3.6 Hypothesis Testing: t Tests. Onyx Corporation designs and manufactures a broad range of fluid handling and industrial products. Although fluid handling products have been a rapidly growing market for Onyx during recent years, operating margins dipped recently as customers have complained about lower reliability for one of the company's principal products. Indeed, one of its leading customers provided Onyx with 2 years of data on the customer's downtime experience:

Onyx Corp. Hours of Downtime per Month


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