Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate: (a) find the critical value tα/2​, ​(b) find the critical value zα/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=218​, x=28.6 ​hg, s=6.6 hg. The confidence level is 99​%.       Select the correct choice below​ and, if​ necessary, fill in the answer box to complete your choice.     A. tα/2=enter your response here ​(Round to two decimal places as​ needed.)   B. zα/2=enter your response here ​(Round to two decimal places as​ needed.)   C. Neither the normal distribution nor the t distribution applies.

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Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate: (a) find the critical value
tα/2​,
​(b) find the critical value
zα/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=218​,
x=28.6
​hg,
s=6.6
hg. The confidence level is
99​%.
 
 
 
Select the correct choice below​ and, if​ necessary, fill in the answer box to complete your choice.
 
 
A.
tα/2=enter your response here
​(Round to two decimal places as​ needed.)
 
B.
zα/2=enter your response here
​(Round to two decimal places as​ needed.)
 
C.
Neither the normal distribution nor the t distribution applies.
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