Solved: In Exercises 520, assume that the two samples are
Chapter 9, Problem 13(choose chapter or problem)
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 a study of proctored and nonproctored tests inan online Intermediate Algebra course, researchers obtained the data for test results given below(based on Analysis of Proctored versus Non-proctored Tests in Online Algebra Courses, by Flesch and Ostler, MathAMATYC Educator, Vol. 2, No. 1). Use a 0.01 significance levelto test the claim that students taking nonproctored tests get a higher mean than those takingproctored tests.Group 1 (Proctored): n = 30, x = 74.30, s = 12.87Group 2 (Nonproctored): n = 32, x = 88.62, s = 22.09
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