If a 99 confidence interval for the difference in the mean w

If a 99% confidence interval for the difference in the mean weights of the student populations in two large cities between 2.75 lbs and 3.75 lbs, a zero difference in the two population means is __________.

A) likely   B) Certain C) unlikely D) impossible

Solution

B) certain , it is because the value zero lies iin the interval -2.75, 3.75. A case ccan be happen the diffrence is zero