I don't understand how to solve for this, help would be much appreciated, thank you

What Influences the Sample Size?

We examine the effect of different inputs on determining the sample size needed to obtain a specific margin of error when finding a confidence interval for a proportion.

Find the sample size needed to give, with 95%

confidence, a margin of error within 4%

when estimating a proportion. First, find the sample size needed if we have no prior knowledge about the population proportion p

. Then find the sample size needed if we have reason to believe that p0.6

. Finally, find the sample size needed if we assume p0.9

.

Round your answers up to the nearest integer.

Population proportion Sample Size

No knowledge:

0.6:

0.9: