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Given a sampling distribution of a sample mean X bar that is normally distributed and has a mean of 30 and a standard deviation of 8, a sample mean of 40 corresponds to:

A. a z value of -1.25

B. a z value of +1.25

C. a sample size of 120

D. a sample size of 300

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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