HW_11_S10[1]

HW_11_S10[1] - AEM 2100 Spring 2010 Homework 11 1 Name...

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Name __________________ Spring 2010 Section _________________ Homework 11 1.) A credit card company operates two customer service centers: one in Boise and one in Richmond. Callers to the service centers dial a single number, and a computer program routs calls to the center having the fewest calls waiting. As part of a customer service review program, the credit card center would like to determine whether the average length of a call (not including hold time) is different for the two centers. The managers of the customer service centers are willing to assume that the populations of interest are normally distributed with equal variances. Suppose a random sample of phone calls to the two centers is selected and the following results are reported. Boise Richmond Sample Size 120 135 Sample Mean (seconds) 195 216 Sample St. Dev. (seconds) 35.10 37.80 a.) Using the sample results, develop a 90% confidence interval estimate for the difference between the two population means. b.) Based on the confidence interval constructed in part a, what can be said about the difference between the average call times at the two centers? Justify your answer. 2.) CEO Chris Foreman of Pacific Theaters Exhibition Corp. is taking steps to reverse the decline in movie attendance. Moviegoers’ comfort is one of the issues facing theaters. Pacific Theaters has begun offering assigned seating, no in-theater advertising, and a live announcer who introduces films and warns patrons to turn off their cell phones. Despite such efforts, an Associated Press/America Online News poll of 1,000 adults discovered that 730 of those surveyed preferred seeing movies in their homes. a.) Using a significance level of 0.025, conduct a hypothesis test to determine if the Associated Press/America Online News poll indicates that more than 70% of adults prefer seeing movies in their homes. Include your p-value.

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HW_11_S10[1] - AEM 2100 Spring 2010 Homework 11 1 Name...

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