Question

I took a large sample of households in a city, and based on that, estimate the standard deviation of the income for all households in the city is $800. In order to make a desired conclusion about the income for all the households in the city, I want the sample mean for another sample to have a standard deviation of no more than $100. How many households must I have in this new sample?
A. 100
B. 8
C. 64

Please help :)

Answer 1

64

Answer 2

Compute a 99% confidence interval for the mean age of the youngest child in all employees’ households