Question

A simple random sample of voters will be taken in a large state. Researchers will use the methods of our course to construct an approximate 95% confidence interval for the percent of the state’s voters who will vote for Candidate X. The minimum sample size needed to ensure that the width of the interval (right end minus left end) is at most 6% is __________. (Fill in the blank with a positive integer; correct to the nearest 50 is OK.)

Answer 1

Zx/2 = 1.96

Answer 2

haha, i see you are taking stats 2.3x.

Answer 3

It might possibly be 4444. then again, im not 100% sure and too afraid to check.

Answer 4

n= (.06)(.094)*(1.96/ Error) ?

Answer 5

@phi

Answer 6

@uri

Answer 7

@Nurali

Answer 8

some suggestion?

Answer 9

@vipergirl81

Answer 10

look this http://www.stat.berkeley.edu/~stark/SticiGui/Text/index.htm Exercise 25-5.

Answer 11

@AonZ

Answer 12

The interval will be widest if the sample percent is 50%. From the center to the edge is 1.96 standard errors, and that has to be 3%, so the equation is

1.96*sqrt(.5*.5/n) = .03

Answer 13

=)