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: nequals=289289​, x overbarxequals=29.429.4 ​hg, sequals=7.17.1 hg. The confidence level is 9999​%.

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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
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:
nequals=289289​,
x overbarxequals=29.429.4
​hg,
sequals=7.17.1
hg. The confidence level is
9999​%.
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