Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t12, (b) find the critical value z,12, 0r (c) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n= 189, x = 29.8 hg, s= 6.6 hg. The confidence level is 90%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/2= %3D (Round to two decimal places as needed.) ОВ. Za/2 = (Round to two decimal places as needed.) %3D

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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 t12, (b) find the critical value z,12, 0r (c) state that neither the normal distribution nor the
t distribution applies.
Here are summary statistics for randomly selected weights of newborn girls: n=
189, x = 29.8 hg, s= 6.6 hg. The confidence level is 90%.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
O A. ta/2=
%3D
(Round to two decimal places as needed.)
ОВ.
Za/2 =
(Round to two decimal places as needed.)
%3D
Transcribed Image Text:Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t12, (b) find the critical value z,12, 0r (c) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n= 189, x = 29.8 hg, s= 6.6 hg. The confidence level is 90%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/2= %3D (Round to two decimal places as needed.) ОВ. Za/2 = (Round to two decimal places as needed.) %3D
Expert Solution
Step 1

Given information-

Sample size, n = 189

Sample mean, x-bar = 29.8 hg

Sample standard deviation, s = 6.6 hg

Confidence level, c = 0.90

So, significance level, α = 0.1

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