Answer:
Step-by-step explanation:
a)
zo=(89.0-92.2)/sqrt((1.5/15)+(1.2/20))
zo=-8.00
p-value=0.0000
Reject the null hypothesis.
b)
95% confidence interval for difference
=(89-92.2)+/-1.96*sqrt((1.5/15)+(1.2/20))
=-3.2+/-0.78
=(-3.98, -2.42)
Answer:
D
Step-by-step explanation:
Answer:
4021.2ft
Step-by-step explanation:
C=pi•d
C=3.14•160
C=502.65
502.65•8= 4021.2