Horribleatmath

1)
A researcher is studying a population of bats in which 16% of the population has a certain trait.

The researcher wants sampling distribution with a standard deviation that is less than 2%.

Which sample sizes could the researcher use?

Select all that apply :

n=200

n=300

n=400

n=500
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2)
From a normally distribution population, a simple random sample of size 38 is taken. The mean of the sample is 82 and the standard deviation of the sample is 4.

What is the 90% confidence interval for the population mean?

Round to the nearest tenth
( [1], 83.1)

topsquark

He already posted 1) here: Please help with math

-Dan