Faoehook: A study showed that two years ago, the mean time spent per visit to Facehook was 19.9 minutes. Assume the standard deviation is G = 6.0 minutes. Suppose that a simple random sample of 103 visits was selected this year and has a sample mean of E = 20.9 minutes. A social scientist is interested to know whether the mean time of Facebook visits has increased. Use the {I = 0.01 level of signicance and the Pvalue method with the 1184 calculator. (a) State the appropriate null and alternate hypotheses. (b) Compute the Pvalue. (c) State a conclusion. Use the [1: 0.01 level of signicance. Part: 0 f4 Partiof4 (a) State the appropriate null and alternate hypotheses. H0: D H1: D This hypothesis test is a [Choose one) 7 tESt- ri - httailed lefttailed twotailed Good credit: The Fair Isaac Corporation (FICO) credit score is used by banks and other lenders to determine whether someone is a good credit risk. Scores range from 300 to 850, with a score of T20 or more indicating that a person is a very good credit risk. An economist wants to determine whether the mean FICO score is lower than the cutoff of 720. She nds that a random sample m 100 people had a mean FICO score of T03 with a standard deviation of 92. Can the economist conclude that the mean FICO score is less than 720? Use the 0'. = 0.01 level of signicance and the Pvalue method with the TI84 Plus calculator. Part: (\"'4 Part 1 of4 State the appropriate null and alternate hypotheses. H: 0 D EI