8 8 points Facebook A study showed that two years ago the mean time spent per visit to Facebook was 20 1 minutes Assume the standard deviation is G 7 0 minutes Suppose that a simple random sample of 103 visits was selected this year and has a sample mean of x 22 1 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 P value method with the table