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a. Calculate a point estimate of the population mean. 6.55 b. Calculate a point estimate of the population standard deviation. 1.8489 c. Calculate the 95% margin of error for the point estimate in part (a). 0.87 d. Calculate a 95% confidence interval for the population mean.

a. Calculate a point estimate of the population mean. 6.55 b. Calculate a point estimate of the population standard deviation. 1.8489 c. Calculate the 95% margin of error for the point estimate in part (a). 0.87 d. Calculate a 95% confidence interval for the population mean.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 6E
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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 20 business travelers is selected and each traveler is asked to provide a rating for ABE airport. The ratings obtained from the sample of 20 business travelers follow. Hint: You can use AVERAGE and STDEV in Excel to answer some of these questions. Hint: Notice that your sample size is <30, meaning when calculating the margin of error, you have to use the t-distribution with (n-1) dofs 6 4 6 8 7 7 8 7 5 9 4 4 8 4 5 9 9 5 9 7 a. Calculate a point estimate of the population mean. 6.55 b. Calculate a point estimate of the population standard deviation. 1.8489 c. Calculate the 95% margin of error for the point estimate in part (a). 0.87 d. Calculate a 95% confidence interval for the population mean. Ⓒ(5.68; 7.42) O(6.20; 8.42) O(5.28; 7.62)
Transcribed Image Text:The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 20 business travelers is selected and each traveler is asked to provide a rating for ABE airport. The ratings obtained from the sample of 20 business travelers follow. Hint: You can use AVERAGE and STDEV in Excel to answer some of these questions. Hint: Notice that your sample size is <30, meaning when calculating the margin of error, you have to use the t-distribution with (n-1) dofs 6 4 6 8 7 7 8 7 5 9 4 4 8 4 5 9 9 5 9 7 a. Calculate a point estimate of the population mean. 6.55 b. Calculate a point estimate of the population standard deviation. 1.8489 c. Calculate the 95% margin of error for the point estimate in part (a). 0.87 d. Calculate a 95% confidence interval for the population mean. Ⓒ(5.68; 7.42) O(6.20; 8.42) O(5.28; 7.62)
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