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You are to conduct a sample survey to determine the mean family income in a rural area of central Florida.

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You are to conduct a sample survey to determine the mean family income in a rural area of central Florida. The question is, how many families should be sampled? In a pilot sample of 10 families, the standard deviation of the sample was $500. The sponsor of the survey wants you to use the 95 percent confidence level. The estimate is to be within $100. How many families should be interviewed?

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Solution Summary

The mean family income in a rural area of central Florida is determined. Statistics in a survey is examined.

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SD =500
CI level = 95%
Since the half range of the CI = z*SE
and z(0.975) ...

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