Facebook: A study showed that two years ago, the mean time spent per visit to facebook was 20.8 minutes.Assume the standard deviation is 10.0 miutes. Suppose that a simple random sample of 103 visits...

Facebook: A study showed that two years ago, the mean time spent per visit to facebook was 20.8 minutes.Assume the standard deviation is 10.0 miutes. Suppose that a simple random sample of 103 visits was selected this year and has a sample mean of X=23.8 minutes. A social scientist is interested to know whether the mean time of facebook visits has changed. Use the a=0.05 level of significance and the critical value method with the table.

A. State the appropriate null and alternate hypotheses

B. Compute the value of the test statistics

C. State a conclusion. Use the a=0.05 level of significance