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 (13.003,13.639) x=13.321 Sx=1.212 n=100 a. What is the number of degrees of freedom that should be used for finding the critical value tα/2​? b. Find the critical value tα/2 corresponding to a 99​% confidence level. c. Give a brief description of the number of degrees of freedom.

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