Question: A sample is to be taken to estimate the average income of a very large city. The population standard deviation = 500. The error allowed

A sample is to be taken to estimate the average income of a
very large city. The population standard deviation = 500. The
error allowed is 30. The confidence interval is 95%.

What is the sample size rounded to the nearest whole number?

AND

In a very large population, a sample of n= 500 is taken to determine
what percent will favor a political issue. If p = .65,

what is standard error of percentage?

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