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September 1, 2015

Homework Help: Statistics

Posted by Steph on Saturday, October 22, 2011 at 7:43pm.

28. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 144 students. The statistics showed that students studied an average of 20 hours per week with a standard deviation of 10 hours. What is the probability that a sample mean would exceed 20 hours per week?
A) 1.96
B) 0.5
C) Cannot be calculated based on the given information.
D) 1.0

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