In a population of 250 people, it is known that the population average is 1.56 with a standard deviation of 0.15. A random sample of 40 people are chosen. What is the smallest interval that will...

In a population of 250 people, it is known that the population average is 1.56 with a standard deviation of 0.15. A random sample of 40 people are chosen. What is the smallest interval that will contain 95% of the sample means?

Standard error (3 decimal places) =

Z = (Enter one of the Z values)