X=19 X =8. X = 8.35
N=17 N =40 N= 30
S=5 s=1.6 s=1.59
What is the Confidence interval at 95%
a)
Given that:
x 19, s 5 and n 17
The 95% of confidence interval is,
Hence, the required 95% of confidence interval is:
b)
Given that:
16.429 21.571
x 8, s 1.6 and n 40
The 95% of…