Step 1 :The null hypothesis (H0) is a statement of no effect or no difference. In this case, the null hypothesis would be that the mean body temperature of a healthy adult is 98.6°F.
Step 2 :The alternative hypothesis (HA) is what you might believe to be true or hope to prove true. In this case, the alternative hypothesis would be that the mean body temperature of a healthy adult is not 98.6°F.
Step 3 :Final Answer: \[H_{0}: \mu = 98.6^{\circ} \mathrm{F}\] \[H_{A}: \mu \neq 98.6^{\circ} \mathrm{F}\]