Question: Here are summary statistics for randomly selected weights of newborn girls: n = 205, x = 30.4 hg, s = 7.1 hg (based on Data

Here are summary statistics for randomly selected weights of newborn girls:

n = 205, x̅ = 30.4 hg, s = 7.1 hg (based on Data Set 4 “Births” in Appendix B). The confidence level is 95%.


Assume that we want to construct a confidence interval. Do one of the following, as appropriate: 

(a) Find the critical value tα/2,

(b) Find the critical value zα/2,

(c) state that neither the normal distribution nor the t distribution applies.

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