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Use the following to answer the questions below:

A sample of 148 college students at a large university reports getting an average of 6.85 hours of sleep last night with a standard deviation of 2.12 hours.

Suppose you want to conduct a similar study at your university. Assuming that the standard deviation of this sample is a reasonable estimate of the standard deviation of sleep time at your university, how many students do you need to survey to estimate the mean sleep time of students at your university with 95% confidence and a margin of error of 0.5 hours?

▸ 70 students

▸ 89 students

▸ 69 students

▸ 88 students
Statistics: Unlocking the Power of Data

Statistics: Unlocking the Power of Data

Edition: 3rd
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youngbloodz Author

2 weeks ago
This site is awesome

Thank you, thank you, thank you!

2 hours ago
You make an excellent tutor!
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