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Estimate the true proportion of home

A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidence?

a. 142

b. 283

c. 566

d. 1132

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## Q : Variance of new home construction costs

Over the last five years in Pa. The variance of new home construction costs has been $108,000. Over the same period of time, based on a sample of 60 new homes , the variance of construction costs in Chester County has been $117,000.