Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (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 newborn girls: n= 178, x= 28.1 hg, s = 7.9 hg. The confidence level is 95%.

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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,/2, (b) find the critical value z,12, 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= 178, x = 28.1 hg, s= 7.9
hg. The confidence level is 95%.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. ta/2=
(Round to two decimal places as needed.)
В.
Za12
(Round to two decimal places as needed.)
O C. Neither the normal distribution nor the t distribution applies.
Transcribed Image Text:Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t,/2, (b) find the critical value z,12, 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= 178, x = 28.1 hg, s= 7.9 hg. The confidence level is 95%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. ta/2= (Round to two decimal places as needed.) В. Za12 (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies.
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