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Here are summary statistics for randomly selected weights of newborn​ girls: nequals178​, x overbarequals27.8 ​hg, sequals7.1...

Here are summary statistics for randomly selected weights of newborn​ girls: nequals178​, x overbarequals27.8 ​hg, sequals7.1 hg. Construct a confidence interval estimate of the mean.

Math   Statistics-And-Probability   
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Answer #1

n = Sample Size = 178

=Sample Mean = 27.8

s = Sample SD = 7.1

SE = s/

= 7.1/ = 0.5322

Take = 0.05

ndf = n - 1 = 178 - 1 = 177

From Table, critical values of t = 1.9735

Confidence Interval:

27.8 (1.9735 X 0.5322)

= 27.8 1.0502

= ( 26.7498 ,28.8502)

So,

Confidence Interval:

26.7498 < < 28.8502

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