Question

A sample​ mean, sample​ size, population standard​ deviation, and confidence level are provided. Use this information to complete parts​ (a) through​ (c) below.

x=32 n=22 0=3 confidence level= 90%

Answer 1

Solution :

Given that,

Sample size = n = 22

Z_/2 = 1.645

Margin of error = E = Z_/2* ( /n)

= 1.645 * (3 / 22)

Margin of error = E = 1.1

At 90% confidence interval estimate of the population mean is,

- E < < + E

32 - 1.1 < < 32 + 1.1

30.9 < < 33.1

(30.9 , 33.1)