Assignment:
The real estate assessor for a county government wants to study various characteristics of single-family houses in the country. A random sample of 70 houses reveals the following:
- Heated area of the house (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 house.
b. Construct a 95% confidence interval estimate of the population proportion of houses that have central air-conditioning.