$($a$)$ No preliminary estimate is available. Find the minimum sample size needed.

$($b$)$ Find the minimum sample size needed, using a prior study that found that $36\%$ of the respondents said they think Congress is doing a good or excellent job.

$($c$)$ Compare the results from parts $($a$)$ and $($b$).$

$($a$)$ What is the minimum sample size needed assuming that no prior information is available?

$n=($Round up to the nearest whole number as needed.$)$

$($b$)$ What is the minimum sample size needed using a prior study that found that $36\%$ of the respondents said they think Congress is doing a good or excellent job?

$n=($Round up to the nearest whole number as needed.$)$

$($c$)$ How do the results from $($a$)$ and $($b$)$ compare?

A$.$ Having an estimate of the population proportion reduces the minimum sample size needed.

B$.$ Having an estimate of the population proportion has no effect on the minimum sample size needed.

C$.$ Having an estimate of the population proportion raises the minimum sample size needed.