The weekly sales at two movie theaters were recorded for a random sample of 25 weeks. A 95 percent confidence interval for the difference in mean weekly sales for the two movie the.

With all else remaining constant, which of the following would have resulted in a confidence interval narrower than the calculated interval?

A) A sample size less than 25

B) A sample size greater than 25

C) An increase to 99 percent confidence

D) A sample mean greater than $1,937

E) A sample mean less than $1,937