Question

Applied UBIDES uiz: Week 8: MyStatLab Final Exam g: 012

Answer 1

1)for 99% CI

for 99 % CI value of z=	2.576
standard deviation σ=	16.30
margin of error E =	3
required sample size n=(zσ/E)2                                         =	197.0

( please try 196 if this comes wrong due to rounding)

2)for 90% CI

for 90 % CI value of z=	1.645
standard deviation σ=	16.30
margin of error E =	3
required sample size n=(zσ/E)2                                         =	80.0

3)

option C: the lower the confidence level ; the smaller the sample size