A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 90% confident that her estimate is within 4 ounces of the true mean? Assume that s=9 dunces based on earlier studies. Use the standard normal z-distribution in your calculations. OA. 14 OB. 2 O C. 12 OD. 4 I

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A: P(Z>z)=18% z=?

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Q: In an experiment to determine whether there is a systematic difference between the weights obtained…

A: Solution: n= 10 Sample size  ∑di=-0.2d = ∑din=-0.210=-0.02  Difference of sample mean…

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A: Answer: Option C.  0.1660

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A: Margin of error = 0.02 p = 0.69 z-critical value = 1.96