Suppose two different samples of the same size,, are taken from a population. Let us call them samplesA and B.

Case 1:Ifsigma is known, then the confidence interval for the mean using samplesAandBwould have:

the same center.

the same width.

the same center and width.

None of the above.

Case 2:If sigmais unknown, then the confidence interval for the mean using samplesA andBwould have:

the same center.

the same width.

the same center and width.

None of the above.

Case 3:The confidence interval for the proportion using samplesA andBwould have:

the same center.

the same width.

the same center and width.

None of the above.