Asked Nov 18, 2019

Suppose that scores on the mathematics part of the National Assessment of Educational Progress (NAEP) test for eighth-grade students follow a Normal distribution with standard deviation = 110. You want to estimate the mean score within + and - 10 with 90% confidence. How large an SRS of scores must you choose? Give your answer as a whole number.



Expert Answer

Step 1

It is given that margin of error (E) is 10, standard deviation is 110 and the confidence level is 90%.

Step 2



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a 1-0.90 0.10 0.10 2 2 0.05 Za Z0.05 =1.645 (Using standard normal table


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