Suppose you have

x(bar)

=15

,

x

=3.24

, and

n=30

.

1) Find the confidence interval when the confidence level is 0.80.

2) Find the confidence interval when the confidence level is 0.85.

Now suppose instead that

n=40

.

3) Find the confidence interval when the confidence level is 0.80.

4) Suppose you know

x

=10

, and

n=4

is the sample size.Find the confidence level of the confidence interval

(35,65)