Author Question: In a certain population, body weights are normally distributed with a mean of 152 pounds and a ... (Read 77 times)

biggirl4568 · **on:** Aug 2, 2018

In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds.

How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96 confidence that the error is no more than 2.5 percentage points.
A) 591 B) 811 C) 1281 D) 1682

Question 2

A newspaper article about the results of a poll states: In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 2 percentage points in either direction from what would have been obtained by interviewing all voters

in the United States. Find the sample size suggested by this statement.
A) 165 B) 2402 C) 3394 D) 4145

cici · **Reply #1 on:** Aug 2, 2018

Answer to Question 1

How great was that.Thank you so much.

Answer to Question 2

Thanks for sharing, assignments makes me feel like end of world..