Question

If all other quantities remain the same, how does the indicated change affect the width of a confidence interval? Decrease the sample size from 120 to 90:

Answer 1

Margin of error is inversely proportional to the sample size( square root of sample size)

As we increase the sample size ,the margin of error decreases & vice versa.

i.e if you decrease your sample size from 120 to 90 ,the margin of error increases,

So

New margin of error = (√120/√90)×old margin of error