7A.10
Researchers collected two different samples, X and Y, of temperatures, in degrees Celsius, of the habitat for Florida scrub lizards. The confidence interval 36 ± 1.66 was constructed from sample X, and the confidence interval 36 ± 1.08 was constructed from sample Y.
Assume both samples had the same standard deviation. Which of the following statements could explain why the width of the confidence interval constructed from X is greater than the width of the confidence interval constructed from Y?


The sample size of X is greater than the sample size of Y, and the confidence level is the same for both intervals.
The sample size of X is greater than the sample size of Y, and the confidence level used for the interval constructed from X is less than the confidence level used for the interval constructed from Y.
The sample size is the same for X and Y, and the confidence level used for the interval constructed from X is less than the confidence level used for the interval constructed from Y.
The sample size is the same for X and Y, and the confidence level is the same for both intervals.
The sample size is the same for X and Y, and the confidence level used for the interval constructed from X is greater than the confidence level used for the interval constructed from Y.