Question: 26. A study was made as to how the concentration of a certain drug in the blood, 24 hours after being injected, is influenced by

26. A study was made as to how the concentration of a certain drug in the blood, 24 hours after being injected, is influenced by age and gender. An analysis of the blood samples of 40 people given the drug yielded the following concentrations

(in milligrams per cubic centimeter).

Age Group 11-25 26-40 41-65 Over 65 Male 52 52.5 53.2 82.4

(a) Test the hypothesis of no age and gender interaction.

(b) Test the hypothesis that gender does not affect the blood concentration.

(c) Test the hypothesis that age does not affect blood concentration.

Age Group 11-25 26-40 41-65 Over 65 Male 52 52.5 53.2 82.4 56.6 49.6 53.6 86.2 68.2 48,7 49.8 101.3 82.5 44.6 50.0 92.4 85.6 43.4 51.2 78.6 Female 68.6 60.2 58.7 82.2 80.4 58.4 55.9 79.6 86.2 56.2 56.0 81.4 81.3 54.2 57.2 80.6 77.2 61.1 60.0 82.2

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