What Influences the Sample Size Needed? In this exercise, we examine the effect of the confidence level on determining the sample size needed. Find the sample size needed to give a margin of error...

Extracted text: What Influences the Sample Size Needed? In this exercise, we examine the effect of the confidence level on determining the sample size needed. Find the sample size needed to give a margin of error within +2 with 99 % confidence. With 95 % confidence. With 90 % confidence. Assume that we use o 30 as our estimate of the standard deviation in each case. Round your answers up to the nearest integer. 99 % : n = 95% : п 3 90 % : n = i