A CNN poll conducted March 4-7, 2020 found that in a randomly selected sample of 356 registered Democrats across the U.S., 190 of them prefer Joe Biden as the party nominee in the 2020 presidential election. We are interested in estimating the true proportion of all registered Democrats in the U.S. who prefer Joe Biden. (Please round all proportions to three decimal places. Do not convert to percentage.)
a) From the survey results, what is the point estimate for the proportion of registered Democrats who prefer Joe Biden?
b) From the survey results, estimate the true proportion of registered Democrats who prefer Joe Biden using a 99% confidence interval.
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c) If someone insists that your result proves that a majority of all registered Democrats prefer Joe Biden, how would you respond?
a) From the survey results, what is the point estimate for the proportion of registered Democrats who prefer Joe Biden?
b) From the survey results, estimate the true proportion of registered Democrats who prefer Joe Biden using a 99% confidence interval.
( , )
c) If someone insists that your result proves that a majority of all registered Democrats prefer Joe Biden, how would you respond?