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 a 8 0 minutes Suppose that a simple random sample of 105 visits was selected this year and has a sample mean of x 21 8 minutes A social scientist is interested to know whether the mean time of Facebook visits has changed Use the a 0 01 level of significance and the P value method with the TI 84 calculator a State the appropriate null and alternate hypotheses b Compute the P value c State a conclusion Use the a 0 01 level of significance Part 0 4 Part 1 of 4 a State the appropriate null and alternate hypotheses Ho H 0 0 O 0 0 8 E