Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t Subscript alpha divided by 2tα/2,
(b) find the critical value z Subscript alpha divided by 2zα/2, or
(c) state that neither the normal distribution nor the t distribution applies.
Here are summary statistics for randomly selected weights of newborn girls:
n=201, x overbar=31.3 hg,
s=7.2 hg. The confidence level is 99%.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. t Subscript alpha divided by 2tα/2equals=nothing
(Round to two decimal places as needed.)
B. z Subscript alpha divided by 2zα/2equals=nothing
(Round to two decimal places as needed.)
C. Neither the normal distribution nor the t distribution applies.