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 with standard deviation of 6. A second sample of 25 men between the ages of 41 and 56 is selected and tested. The average of this group is 229 with standard deviation of 11. Use α = 0.01, to test the difference in the cholesterol levels between the two groups. Formulate the null and alternative hypotheses?

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