A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes o is 1.8 minutes and that the population of times is normally distributed. 11 8 10 12 7 11 12 6. 8. 8 8 9. 6. Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence intervals. The 90% confidence interval is ). (Round to one decimal place as needed.)

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A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes σ is 1.8 minutes and that the population of times is normally distributed.

Sample data: 11, 8, 7, 10, 12, 7, 11, 2, 6, 12, 6, 8, 9, 9, 6 

Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence intervals.

The 90% confidence interval is [_____, _____]. (Round to one decimal place as needed.)

Enter your answer in the edit fields and then click Check Answer.

[Interface elements below include a text entry field, a "Clear All" button, a "Check Answer" button, and a navigation control.]
Transcribed Image Text:A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes σ is 1.8 minutes and that the population of times is normally distributed. Sample data: 11, 8, 7, 10, 12, 7, 11, 2, 6, 12, 6, 8, 9, 9, 6 Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence intervals. The 90% confidence interval is [_____, _____]. (Round to one decimal place as needed.) Enter your answer in the edit fields and then click Check Answer. [Interface elements below include a text entry field, a "Clear All" button, a "Check Answer" button, and a navigation control.]
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