Question

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 lower than the cutoff of 720. She finds that a random sample of 50 people had a mean FICO score of 707 with a standard deviation of 79. Can the economist conclude that the mean FICO score is less than 720? Use the α=0.10

level of significance and the critical value method.

A) State null and alternative hypothesis

b) compute critical value

c) compute value of test statistic

d) state conclusion using level of significance

e) reject/accept null hypothesis

F) is there enough info to conclude

Answer 1

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