The real estate assessor for a county government wants to study

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The real estate assessor for a county government wants to study various characteristics of single-family houses in the county. A random sample of 70 houses reveals the following: • Heated area of the houses (in square feet): X=1,759, S= 380. • 42 houses have central air-conditioning a. Construct a 99% confidence interval estimate of the population mean heated area of the houses. b. Construct a 95% confidence interval estimate of the population proportion of houses that have central air-conditioning.