Birth Weights of InfantsA health care professional wishes

Chapter 7, Problem 23E

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QUESTION:

Problem 23E

Birth Weights of InfantsA health care professional wishes to estimate the birth weights of infants. How large a sample must be obtained if she desires to be 90% confident that the true mean is within 2 ounces of the sample mean? Assume σ = 8 ounces.

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QUESTION:

Problem 23E

Birth Weights of InfantsA health care professional wishes to estimate the birth weights of infants. How large a sample must be obtained if she desires to be 90% confident that the true mean is within 2 ounces of the sample mean? Assume σ = 8 ounces.

ANSWER:

Solution:

Step 1 of 2:

          From the given problem, we have

         

          The standard deviation ounces.

                                                E = 2

  Here we have to find the sample size.


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