Determine the sample size required to estimate the mean score on a standardized test within 2...
Determine the sample size required to estimate the mean score on a standardized test within
2 points of the true mean with 90% confidence. Assume that s = 16 based on earlier studies.
A) 14
B) 272
C) 1
D) 174
Homework Answers
Given that, population standard deviation 
= 16 and
margin of error (E) = 2
A 90% confidence level has significance level of 0.10 and
critical value is, 
We want to find, the sample size (n),
=> n ≈ 174 (rounded to next whole number)
Therefore, required sample size is 174
Answer : D) 174
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