Question

In a random sample of 765 adults in the United States, 322 say they could not cover a $400 unexpected expense without borrowing money or going into debt. A.)Find the mean and the standard deviation of p-hat for this sample B.) Given the sample data in problem (1) above, construct a confidence interval at the 95% confidence level for the true proportion of Americans who could not cover a $400 unexpected expense without borrowing money or going into debt. C.)4) Finding confidence intervals stems from getting a normal distribution of a sample proportion p-hat. If I estimate my population proportion to be no greater than 95%, what is the smallest sample size I can use to ensure I have a large enough sample to make a confidence interval?

          In a random sample of 765 adults in the United States, 322 say
they could not cover a $400 unexpected expense without borrowing
money or going into debt.
A.)Find the mean and the standard deviation of p-hat for this
sample
B.) Given the sample data in problem (1) above, construct a
confidence interval at the 95% confidence level for the true
proportion of Americans who could not cover a $400 unexpected
expense without borrowing money or going into debt.
C.)4) Finding confidence intervals stems from getting a normal
distribution of a sample proportion p-hat. If I estimate my
population proportion to be no greater than 95%, what is the
smallest sample size I can use to ensure I have a large enough
sample to make a confidence interval?

Added by M-Nica M.

Question

Please give Ace some feedback