Thread: Test the hypothesis

QUESTION: Past experience indicates that the time for high school seniors to complete standardized test is a normal random variable with a standard deviation of 6 minutes. Test the hypothesis thatσ =6 against the alternative that σ< 6 if a random sample of 20 high school seniors has a standard deviation s=4.51. Use a 0.05 level of significance.

Originally Posted by m777

QUESTION: Past experience indicates that the time for high school seniors to complete standardized test is a normal random variable with a standard deviation of 6 minutes. Test the hypothesis thatσ =6 against the alternative that σ< 6 if a random sample of 20 high school seniors has a standard deviation s=4.51. Use a 0.05 level of significance.

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RonL