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Based on the performance of all individuals who tested between July 1, 2013 and June 30, 2016, the GRE Verbal Reasoning scores are normally...

.  Based on the performance of all individuals who tested between July 1, 2013 and June 30, 2016, the GRE Verbal Reasoning scores are normally distributed with a mean of 149.97 and a standard deviation of 8.49. (https://www.ets.org/s/gre/pdf/gre_guide_table1a.pdf). Show all work. Just the answer, without supporting work, will receive no credit.

  (a) Consider all random samples of 36 test scores. What is the standard deviation of the sample means? (Round your answer to three decimal places)

(b) What is the probability that 36 randomly selected test scores will have a mean test score that is between 150 and 155? 

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a) the standard deviation of the sample means = 1.415 b) The... View the full answer

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1) standard deviation of the sample mean (  σ  xbar) =... View the full answer

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