2. Over a period of years, a toothpaste has received a mean rating of 5.9, on...
2. Over a period of years, a toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the customer satisfaction may have changed. Suppose the satisfaction ratings from a sample of 60 customers have a mean of 5.60 and a standard deviation of .87. Do these data indicate that the mean satisfaction rating is different from 5.9?
- What are the null and alternative hypotheses?
- What is the standard error of the sample mean?
- What is the p-value for the test?
- What is your conclusion, at the .05 level of significance?
Homework Answers
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2. Over a period of years, a toothpaste has
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8 plant wants to determine whether the mean manager performance ratings ed over the past month. The table shows the plant's perfomance ratings for 3. A manufacturing want the same six managers last month an d this month. 6 78 89 5 81 92 4 76 86 Manager Number1 Rating (last month) 85 Rating (this month) 88 2 96 85 70 89 Sample standard deviation Summary Statistics Rating (last month) Rating (this month) Difference Mean 81.00 88.17 8.90 2.48 10.24...
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Check My Work Consumer Reports uses a 00-point customer sa s action score to rate the nation's ma or chain stores. Assume at om past experience with the satis action rating score, a popu ation standard deviation o σ was the only chain store to earn an outstanding rating for overall quality, A sample of 15 Costco customer satisfaction scores follows is expected. Costco with its 32 warehouses in 0 states 92 97 90 85 80 a. What is the...
Consumer Reports uses a survey of readers to obtain customer satiofaction ratings for the nation's largest retailers (Consumer Reperts, March 2012) Each survey respondent is asked to rate a specified retailer in terms of six factors: quality of products, selection, value, checkout efficiency, service, and store layout. An overall satisfaction score summarizes the rating for each respondent with 100 meaning the respondent is completely satisfied in terms of all six factors. Sample data representative of independent samples of Target and...
A random sample of 172 marketing students was asked to rate, on
a scale from 1 (not important) to 5 (extremely important), health
benefits as a job characteristic. The sample mean rating was 4.06,
and the sample standard deviation was 0.6. Test at the 1%
significance level the null hypothesis that the population mean
rating is at most 4 against the alternative that it is larger than
4.
What are the null and alternative hypotheses for this test?
For this...
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Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of a 14 is expected. In 2012. Costco, with its 432 warehouses in 40 states, was the only chain store to cam an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores follows 95 908375 95 83 82 93 94 6462 (a) What is the sample mean...
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