Question

Today, full-time college students report spending a mean of 27 hours per week on academic activities,...

Today, full-time college students report spending a mean of 27 hours per week on academic activities, both inside and outside the classroom. (Source: “A Challenge to Col- lege Students for 2013: Don’t Waste Your 6,570,” Huffington Post, January 29, 2013, huff.to/13dNtuT.) Assume the standard devia- tion of time spent on academic activities is 4 hours. If you select a random sample of 16 full-time college students,

PLEASE USE NORMDIST AND NORMINV IN EXCEL

  1. what is the probability that the mean time spent on academic activities is at least 26 hours per week?

  2. there is an 85% chance that the sample mean is less than how many hours per week?

  3. What assumption must you make in order to solve (a) and (b)?

  4. If you select a random sample of 64 full-time college students, there is an 85% chance that the sample mean is less than how many hours per week?

  5. The probability is 66% that the sample mean will be between what two values symmetrically distributed around the population mean?

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