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IQ scores: Scores on an IQ test are normally distributed. A sample of 25 IQ scores had standard deviation s = 8. The developer of the test claims that the population standard deviation is greater than o = 15. Do these data provide sufficient evidence to support this claim? Use the a = 0.05 level of significance. Part 1 of 5 State the appropriate null and alternate hypotheses. H:0 = 15 H:0 > 15 This hypothesis test is a right-tailed test. Part: 1 / 5 Part 2 of 5 Find the critical value. Round the answer to three decimal places. X For a = 0.05, the critical value is 37.652