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 'ange from 300 to 850, with a score of 720 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 finds that a random sample of 55 people had a mean FICO score of 685 with a standard deviation of 80. Can the economist conclude that the mean FICO score is less than 720? Use the a: 0.10 level of significance and the critical value method. Part: 0/5 Part 1 of5 Part2 of5 Find the critical value(s). Round the answer(s) to at least three decimal places. If there is more than one critical value, separate them with commas. Critical value(s): ' I EIEI Part:2/5 Part3 of5 (b) Compute the value of the test statistic. Round the answer to at least three decimal places. t=l l _ X 53