a. (mean)=23  z-value p-value b.  (mean)= 25.1 z-value p-value c. (mean)=20 z- value p-value

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A: Mean = 70 Standard deviation = 30

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A: Given,Z-score is -1.50

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Q: Determine the sample size required to estimate the mean score on a standardized test within 2 points…

A: Given,margin of error(E)=2standard deviation(s)=15α=1-0.98=0.02α2=0.01Z0.01=2.33      (from Z-table)