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The director of a radio broadcast company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.A sample of 41 commercials had a mean life of 26.90 seconds and a standard deviation of 7.88 seconds.The significance level is 5%.
-What are the critical values of t?

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The critical values of t for a two-tailed test with a significance level of 5% and 40 degrees of freedom (n-1 = 41-1) are approximately -2.021 and 2.021.

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