Mr. Knowitall is on a city council. Last week, his committee put together a repo

Question

Mr. Knowitall is on a city council. Last week, his committee put together a report using a 90% confidence interval. The population from which the data are pulled is known to follow a Normal Distribution. He's since determined that he'd prefer the report based on a 95% confidence interval instead. What might be a better way for the city planners to achieve a more precise estimate? (Check all that apply) A. Find a way to get more data. B. Find a way to increase the t-score. C. Find a way to increase the Z-score. D. Find a way to use the CLT. E. Find a way to decrease the standard deviation.

Explanation / Answer

Note that using a 95% confidence interval inevitable increases the critical z score, which would increase the margin of error.

As increasing sample size decreases the margin of error, then he should

OPTION A. Find a way to get more data. [ANSWER, A]

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