Question

4. A random sample of 900 voters was asked whether they approve of the President’s economic policies. 423 said they do not. a. What is the point estimate? Explain. b. Find the 92% confidence interval estimate. c. What sample size would be appropriate if the survey wanted to be 95% sure with an error of no more than 3%? please write all formulas and the exact process to obtain the answer, thank you

Answer 1

4. . Here it is given that out of 900 voters 423 said that they do not approve of the President’s economic policies.

a. So point estimate is proportion .

b. Now for 92%, z value is 1.751 as

And also

So Margin of Error is

Hence CI is

c. Here z value is 1.96 as

Also E=0.03.

So we will find n using formula of E

So