Researchers studying public opinion proposed Social Security changes obtains a simple random sample of 30 adult Americans

Question:

Researchers studying public opinion proposed Social Security changes obtains a simple random sample of 30 adult Americans and asked them whether or not they support the proposed changes. To say that the distribution of the sample proportion of adults who respond yes, is approximately normal, how many more Americans does the researcher need to sample in the following cases?

(a) 20% of all adult Americans support the changes

(b) 25% of all adults Americans support the changes

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...