For randomly selected adults, IQ scores are normally distributed with a7)standard deviation of 15. The scores of 14 randomly selected college

students are listed below. Use a 0.10 significance level to test the claim

that the standard deviation of IQ scores of college students is less than 15. Round the sample standard deviation to three decimal places.

115 128 107 109 116 124 135

127 115 104 118 126 129 133

a) State the hypothesis?

b)What are your critical value(s)?

c) What is your test statistics?

d) What is the conclusion with respect to the null hypothesis?

e)What is the conclusion with respect to the claim?

f)Construct a 90% confidence interval for the standard dec\viation of IQ scores of college students.