A personality test has a subsection designed to assess the \"honesty\" of the te

Question

A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score,M , on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate M. What is the minimum sample size needed in order for you to be 9% confident that your estimate is within 3 of M? Use the value 23 for the population standard deviation of scores on this subsection. Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).

Explanation / Answer

Sample size

Explanation:

Z value for 90% confidence level is 1.645

Sample size = [(23*1.645)/3]^2

= 159.05

Therefore, required sample size will be 159

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