Listed in the table below are body temperatures (°F) of randomly selected subjects from three different age groups. The STATDISK display in Figure 10.3 results from these sample values. Assume that we want to use a 0.05 significance level to test the claim that the three age groups have the same mean body temperature.

a. What is the null hypothesis?
b. What is the alternative hypothesis?
c. Identify the P-value.
d. Is there sufficient evidence to reject the claim that the three age groups have the same mean body temperature?

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18-20 98.0 98.4 97.7 98.5 97.1 21-29 99.6 98.2 99.0 98.2 97.9 30 and older 98.6 98.6 97.0 97.5 97.3