Assume that we want to construct a confidence interval. Do one
of the following, as appropriate: (a) find the critical value
tĪ±/2, (b) find the critical value zĪ±/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=188, x=30.7 hg, s=6.7 hg. The confidence level
is 99%. Select the correct choice below and, if necessary, fill
in the answer box to complete your choice.
A. tĪ±/2= (Round to two decimal places as needed.)
B. zĪ±/2= (Round to two decimal places as needed.)
C. Neither the normal distribution nor the t distribution
applies.