Class--The formula for finding the interval:X-E<

and we know thatE=Zc(/n)

Eis the margin of error

nis the sample size

is standard deviation

Zcis the critical value that is related to the level of confidence

For the same sample size--when the level of confidence increases the margin of error increases which increases the width of the interval. Now--look at the formula forEcarefully--what happens if n increases? Will the E increase or decrease?