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Construct a confidence interval

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Question 1.

A simple random sample from a population with a normal distribution of 99 body temperatures has x=98.10°F and s=0.66°F. Construct a 90?% confidence interval estimate of the standard deviation of body temperature of all healthy humans.

----- Degree F <σ< ---- Degree F ( fill in the blank round to 2 decimals)

Question 2.

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?, 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=188?, x=31.1 ?hg, s=6.3 hg. The confidence level is 90?%.

Reference no: EM132845469

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