Solved: In Exercises 520, assume that the two samples are

Chapter 9, Problem 14

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In Exercises 520, assume that the two samples are independent simple random samplesselected from normally distributed populations, and do not assume that the populationstandard deviations are equal. Do the following:a. Test the given claim using the P-value method or critical value method.b. Construct a confidence interval suitable for testing the given claim. Proctored and nonproctored Tests In the same study described in the precedingexercise, the same groups of students took a nonproctored test; the results are given below.Use a 0.01 significance level to test the claim that the samples are from populations with thesame mean.Group 1 (Nonproctored): n = 30, x = 70.29, s = 22.09Group 2 (Nonproctored): n = 32, x = 74.26, s = 18.15