number 23

Assume that we want to construct a confidence interval. Do one of thefollowing, asappropriate: (a) find the critical value t/2, (b) find the critical value z/2, or(c) state that neither the normal distribution nor the t distribution applies.

Here are summary statistics for randomly selected weights of newborngirls: n=271, x=30.1 hg, s=7.5 hg. The confidence level is 99%.

Select the correct choice belowand, ifnecessary, fill in the answer box to complete your choice.

A.

t/2= ----- (Round to two decimal places asneeded.)

B- z/2= ------- (Round to two decimal places asneeded.)

C.

Neither the normal distribution nor the t distribution applies.