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A researcher wishes to see if there is a difference in the cholesterol levels
of two groups of men. A random sample of 30 men between the ages of 25
and 40 is selected and tested, the average cholesterol level was 223 with
standard deviation of 6.1. A second sample of 25 men between ages of 41
and 56 is selected and tested, the average cholesterol level for this group
was 229 with standard deviation of 5.8. Assume the populations are
normally distributed and the population standard deviation are unequal.
A. At [tex]\alpha = 0.01[/tex], is there a difference in the cholesterol levels between the
two groups? Use traditional method.
B. Use confidence interval to verify your answers in (A).
Sagot :
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