Dear Tutor, Thank you for all your assistance, please refer to my below 2 questions,

I have download the document from course hero it mentions the answer, not the formula it was calculated.

However, I have did some digging and found the formula to calculate but the answer not make sense to me.

Please kindly refer to the below question, WHY N= 25? it does not mention anywhere in the subject how did get this figure?

Then if I follow the same method to call calculate the answer don't exist?

Q1 . 0.04 = 1/25 = why?

25^25 = 625 closes is 600. fine

Q2. if 0.02 = 1/50 right?

so 50 x 50 = 2500 don't exsist.

And from the downloaded document, I found the answer was C?

Please kindly assist me thank you.

1.How many randomly selected employers (minimum number) must we contact in order to guarantee a margin of error of no more than 4% (at 95% confidence)?

A.6000.04 = 1/25

B.400= 25^25

C.550= 625

D.1000

2.Suppose we want the above margin of error to be based on a 98% confidence level. What sample size (minimum) must we now use?

A.1000

B.757

C.848

D.543