A statistician claims that the average score on a standardized test of students who major is psychology is greater than that of the average student.  The results of the test, given to 70 pyschology students, had a sample mean of 85 with a sample standard deviation of 4.  If the population average is 80, is there enough evidence to support the statistician's claim at a level of significance of 0.025?  (T-Test) What is the Test Value? What is the critical value needed for this test?

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