A random sample of 400 manufacturing firms from a population of 15,000 such firms yielded a value of after-tax profits, x , of $2.0 million. Assume...

A random sample of 400 manufacturing firms from a population of 15,000 such firms yielded a value of after-tax profits, x , of $2.0 million. Assume the standard deviation is known to be $1.0 million. A 95% CI for the mean after-tax profits for the entire population of 15,000 firms is closest to