10.

An economist for the government needs to estimate the mean income for households

not covered by health insurance in the city of Albany.

He collects a random sample of

1,500 families, and finds the mean income for the sampled households is $18,870 with a

standard deviation of $7,240

a)

Define the population of interest

b)

Calculate a reasonable confidence interval around this estimate of the population

mean, and interpret your response.