Econ 3640_002 Quiz 3_FA16

A researcher is interested in the size of the current

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11. A researcher is interested in the size of the current balance of credit card holders. To estimate this, he obtains the size of the current balance of a random sample of 25 credit card holders. A 90% confidence interval for the mean current balance of credit card holders is found to be $662.72 ± $44.70. Which of the following would produce a confidence interval with a smaller margin of error than this 90% confidence interval?
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