A random sample of adult females is partitioned into the age categories 18–24, 25–50, and over 50. The pulse rates of the subjects in the three different age categories are measured, and the analysis of variance results obtained from Excel are shown in Figure 10.6. Use a significance level of 0.05.

 Figure 10.6

a. What is the null hypothesis? 

b. What is the alternative hypothesis?

c. Identify the P-value.

d. Is there sufficient evidence to support the claim that adult females in the different age categories have different mean pulse rates?

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Source Model Error Corrected Total DF 2 144 146 Sum of squares 1388.094 21583.661 22971.755 Mean squares F 694.047 4.630 149.887 Pr> F 0.011