Can someone please help me on this problem? Thank you!

Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.0 minutes. Assume the standard deviation is o - 5.0 minutes. Suppose that a simple random sample of 109 visits was selected this year and has a sample mean of x =21.0 minutes. A social scientist is interested to know whether the mean time of Facebook visits has changed. Use the a=0.10 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 statistic. (c) State a conclusion. Use the a- 0.10 level of significance