**Confidence interval exercise**

Given the following information
determine the **95%** confidence interval for each mean:

N = 20, s^{2}= 9, M = 14.1

N = 30, s^{2}= 10, M = 98.9

N = 12, s^{2}= 6, M = 1.5

N = 25, s^{2}= 14, M = 16

Formula for 95% confidence interval:

M+1.96 * (s/ √N)

observed mean plus and minus (1.96 times the (standard deviation divided by the square root of the sample size))