We are performing a one-sample z-test about mean. The sample size is 64 , the sample mean 56.7 , the sample standard deviation is 30 , and the testing mean is 60 . What is the value of the test statistic? 0.880 0.014 56.700
-0.880

-0.014
Suppose that a random sample of size 100 is to be selected from a population with mean 40 and standard deviation 8 . What is the probability that a sample mean will be less than 40.8 ? Round your answer to three decimal places. .460 .500 .841 .159 .540

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We are performing a one-sample z-test about mean. The sample size is 64 , the sample mean 56.7 , the sample standard deviation is 30 , and the testing mean is 60 . What is the value of the test statistic? 0.880 0.014 56.700

-0.880

-0.014

Suppose that a random sample of size 100 is to be selected from a population with mean 40 and standard deviation 8 . What is the probability that a sample mean will be less than 40.8 ? Round your answer to three decimal places. .460 .500 .841 .159 .540

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