A sample with a sample proportion of 0.5 and which of the following sizes will produce the widest 95% confidence interval when estimating the population parameter?

A. 70
B. 60
C. 50
D. 80

Question

A sample with a sample proportion of 0.5 and which of the following sizes will produce the widest 95% confidence interval when estimating the population parameter?

A. 70
B. 60
C. 50
D. 80

kj4uts · Answer

I think the answer is D. 80 because a larger sample size produces a tighter confidence interval. But it also may be C. 50 the smaller number I am not sure. I just want to check. Please explain. Thank you!

anonymous · Answer

C, a wider confidence interval means you're less precise. (It's the opposite of a tighter confidence interval).