SOLUTION: 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.

Question 836097: 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 level is 223. A second sample of 25 men between ages of 41 and 56 is selected and tested. The average level of this group is 229. The population standard deviation for both groups is 6. At 0.01,   is there a difference in the cholesterol levels between the two
groups? Use the confidence interval method.
Answer by new_user(6) (Show Source): You can put this solution on YOUR website!
Use Z test since population standard deviation is known. If you need further help then contact me. Cheers!
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