Sol:
Before the program mean =
= 255.66667 and after program mean =
= 231.83333
Before the program standard deviation =
= 23.8635 and after program standard deviation =
= 5.84522
sample size = 6 for both after and before program.
Two sample t-test for population mean to test the claim that
>
Assumption: that the population follows normal distribution and the
the groups after and before the program have equall variances. And
the samples are independent of each other.
As p value is less than significance level of 0.05 hence we reject
null hypothesis and accept the alternative hypothesis that the mean
cholesterol level has fallen after the program
d)
As the 95% confidence intervel of difference on the two means
doesn't contain 0 hence the interval also verifies the claim made
by our test and the conclusion above in part b)
e).
If the null hypothesis is true, what is the probability you
conclude that ?1 > ?2?
Answer: this probability of rejecting null hypothesis when its
actually true is the Type I error and that for this test is the
significance level of the test = 0.05
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