MATH eBook Ba Help Hosted by ALEKS Corp HW 9.3 Hypothesis Tests for a Population Mean, Standard Deviation Unknown 3 5 6 7 8 Question 4 of 8 (1 point) |Attempt 1 of Unlimited |View question in a popup 9.3 Section Exercise 18 (p-value, calc 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 720 or more indicating that a person is a very good credit risk. An economist wants to determine whether the mean FICO score is more than the cutoff of 720. She finds that a random sample of 90 people had a mean FICO score of 730 with a standard deviation of 91. Can the economist conclude that the mean FICO score EO is greater than 720? Use the a - 0.05 level of significance and the P-value method with the TI-84 Plus calculator. Part: 0 / 4 Part 1 of 4 State the appropriate null and alternate hypotheses. Hot H1 : Save For Later Skip Part Check Answer 3 2022 MeGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Centeruse the (a) State the appropriate null and alternate hypotheses. (b) Compute the P-value of the test statistic. (c) Determine whether to reject /. Use the a = 0.10 level of significance. (d) State a conclusion. Explanation We begin by checking the assumptions. Assumptions for a Test of a Population Mean u When o Is Unknown 1. We have a simple random sample. 2. The sample size is large (# > 30), or the population is approximately normal. Since the sample size is large, the assumptions are met