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Mathematics, 26.01.2021 01:20 jacobmacalpine

Last year, the standard deviation of the ages of the students at UA was 1.81 years. Recently, a sample of 10 students had a standard deviation of 2.1 years. We are interested in testing to see if there has been a significant change in the standard deviation of the ages of the students at UA. At 95% confidence the null hypothesis A. should be rejected
B. should not be rejected
C. should be revised
D. None of these alternatives is correct.

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