Refer to the technology output given to the right that results from measured hemoglobin levels​ (g/dL) in 100 randomly selected adult females. The confidence level of 99​% was used. TInterval (13.017,13.727) x=13.372 Sx=1.353 n=100   a. Express the confidence interval in the format that uses the​ "less than" symbol. Assume that the original listed data use two decimal​ places, and round the confidence interval limits accordingly. b. Identify the best point estimate of μ and the margin of error. c. In constructing the confidence interval estimate of μ​, why is it not necessary to confirm that the sample data appear to be from a population with a normal​ distribution?

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Refer to the technology output given to the right that results from measured hemoglobin levels​ (g/dL) in 100 randomly selected adult females. The confidence level of 99​% was used.

TInterval
(13.017,13.727)
x=13.372
Sx=1.353
n=100
 
a. Express the confidence interval in the format that uses the​ "less than" symbol. Assume that the original listed data use two decimal​ places, and round the confidence interval limits accordingly.
b. Identify the best point estimate of μ and the margin of error.
c. In constructing the confidence interval estimate of μ​, why is it not necessary to confirm that the sample data appear to be from a population with a normal​ distribution?
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