AIR MATH

Math Question

A \( 95 \% \) confidence interval is found to be \( (30,36) \). The sample standard deviation is 9 , and the sample size is 36 . If you wanted a smaller interval, what could you do? A. Increase the confidence level to \( 99.7 \% \). B. None of these C. Decrease the sample size to 30 . D. Increase the sample size to 100 .

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