6. In a random sample of 200 American voters, 96 gave President Biden a positive evaluation. Set up a 92 percent confidence interval for the proportion of American voters, giving President Biden a positive evaluation. (10 Points) 7. How large a sample is needed to estimate the proportion of Americans approving President Biden nominating Mr. Powell's renomination to the chairmanship of Federal Reserve Board? Assuming you have no idea about the value of the proportion and you want this proportion to be within 0.032 and confidence3 level of 97 percent. (10 Points)