QUIZ-chapter8

# QUIZ-chapter8 - Correct. An automobile financing company is...

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Correct. An automobile financing company is interested in estimating how satisfied customers are with their service. They develop a question in which a customer is ask to rate the service of the company on a scale of from 1 to 10 where 1 is extremely dissatisfied and 10 is extremely satisfied. Fifty such responses are randomly selected and analyzed. The sample mean is 7.28 and the population is 1.07. If the company concludes that the mean satisfaction score for all of their customers is 7.28, then they are using a: a statistical parameter an interval estimate a point estimate a range estimate Wiley Plus Question 5 Correct. The z value associated with a two-sided 90% confidence interval is: 1.64 5 1.9 6 1.2 8 2.57 5

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Wiley Plus Question 7 Correct. Suppose a random sample of 36 is selected from a population with a standard deviation of 12. If the sample mean is 98, the 99% confidence interval to estimate the population mean is: 92.85 to 103.15 97.35 to 98.65 93.34 to 102.66 94.08 to 101.92 Wiley Plus Question 9 Correct. What is the average length of a wireless phone call? Suppose researchers in the telecommunications industry want to estimate the average number of minutes of a wireless call. To do so, they randomly select one such call from 85 wireless phone bills around the country. The resulting sample mean is 2.54 minutes with a population standard deviation of 1.20 minutes. From these data, the 86% confidence interval to estimate the average length of a wireless phone call for all users is: 2.519 to 2.561 2.326 to 2.754 2.347 to 2.733 2.285 to 2.795
Wiley Plus Question 15 Correct. A researcher is taking a random sample of 18 items in an effort to estimate the population mean. He wants to be 95% confident of his results. The table t value that he should use is: 2.1 01 1.7 40

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Wiley Plus Question 17 Correct. A researcher is interested in estimating the mean value for a population. She takes a random
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## This note was uploaded on 04/27/2010 for the course STATISTICS 5031 taught by Professor Kenblack during the Spring '10 term at UH Clear Lake.

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QUIZ-chapter8 - Correct. An automobile financing company is...

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