Question: A sample survey is being planned in which it is desired to estimate the average ratio of medical expenses to family income in a large

A sample survey is being planned in which it is desired to estimate the average ratio of medical expenses to family income in a large city containing 234,785 families. Based on data in the table accompanying Exercise 7.2, how many families would have to be sampled if it is desired to estimate with 95%

certainty this parameter to within 5% of its true value?

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