According to Nielsen//NetRatings, the average visitor to the American Greetings Website spends 11.85 minutes at the site. Assuming this finding to be based on a random sample of 20 visitors to the site, a POPULATION standard deviation of 3.0 minutes, and a population of visiting times that is approximately normally distributed, a 99% confidence interval for the population mean is closest to 10.8840 to 12.8160 O 10.7465 to 12.9535 10.1226 to 13.5774 O 10.2870 to 13.4130 10.5352 to 13.1648.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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**Confidence Interval Calculation for Population Mean: Educational Insight**

According to Nielsen//NetRatings, the average visitor to the American Greetings Website spends 11.85 minutes at the site. Assuming this finding to be based on a random sample of 20 visitors to the site, a POPULATION standard deviation of 3.0 minutes, and a population of visiting times that is approximately normally distributed, a 99% confidence interval for the population mean is closest to:

- **Option A:** 10.8840 to 12.8160
- **Option B:** 10.7465 to 12.9535
- **Option C:** 10.1226 to 13.5774
- **Option D:** 10.2870 to 13.4130
- **Option E:** 10.5352 to 13.1648
Transcribed Image Text:**Confidence Interval Calculation for Population Mean: Educational Insight** According to Nielsen//NetRatings, the average visitor to the American Greetings Website spends 11.85 minutes at the site. Assuming this finding to be based on a random sample of 20 visitors to the site, a POPULATION standard deviation of 3.0 minutes, and a population of visiting times that is approximately normally distributed, a 99% confidence interval for the population mean is closest to: - **Option A:** 10.8840 to 12.8160 - **Option B:** 10.7465 to 12.9535 - **Option C:** 10.1226 to 13.5774 - **Option D:** 10.2870 to 13.4130 - **Option E:** 10.5352 to 13.1648
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