A medical researcher wants to determine whether a drug changes the body’s temperature. Seven test subjects are randomly selected, and the body temperature (in degrees Fahrenheit) of each is measured. The subjects are then given the drug and, after 20 minutes, the body temperature of each is measured again. The results are listed below. At α = 0.05, is there enough evidence to conclude that the drug changes the body’s temperature? Assume the body temperatures are normally distributed.

a. Identify the claim and state H₀ and H_a.

b. Identify the level of significance α and the degrees of freedom.

c. Find the critical values and identify the rejection regions.

d. Calculate d̅ and s_d.

e. Find the standardized test statistic t. Sketch a graph.

f. Decide whether to reject the null hypothesis.

g. Interpret the decision in the context of the original claim.

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Subject Initial temperature 101.8 98.5 98.1 99.4 98.9 100.2 97.9 Second temperature 99.2 98.4 98.2 99.0 98.6 99.7 97.8 6