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a)95% confidence interval for the population mean birth weight in these hospitals is (3078.9358,3221.0642).
(b)The P-value is 0.0068.
To test the null hypothesis and the alternative hypothesis, all analysts employ a random population sample. The null hypothesis typically states that two population parameters are identical; for instance, it can claim that the population mean return is equal to zero.
A strategy for determining how reliably one may extrapolate observed results in a study sample to the larger population from is provided by hypothesis testing, a procedure used to assess the strength of the evidence from the sample and give a framework for doing so.
C.I=x-t(alpha/2)xs/sqrt{n}
=3150+_2.01*250/sqrt{50}
=(3078.9358,3221.0642)
b) P value =P(t<-2.83)+P(t>2.83)
use calculator
=0.0034+0.0034
=0.0068
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