Question

A simple random sample of 60 items from a population with σ = 8 resulted in a sample mean of 35. If required, round your answers to two decimal places.

Answer 1

Explanation

The confidence interval is defined by:

a. For a 90% confidence interval, z = 1.64. Then the confidence interval is: in my question z=1.64

b. For a 95% confidence interval, z = 1.96. The CI is: z=1.96

c. For a 99% confidence interval, z = 2.57. The CI is: z=2.57

I really don't know but i think this is it