Problem
A study by researchers at a university addressed the question of whether the mean body temperature of an animal is $98.3^{\circ} \mathrm{F}$. Among other data, the researchers obtained the body temperatures of 102 healthy animals. Suppose you want to use those data to decide whether the mean body temperature of healthy animals is less than $98.3^{\circ} \mathrm{F}$. Complete parts (a) through (c) below. a. Determine the null hypothesis. \[ \mathrm{H}_{0}: \mu \square \square \square \] (Type an integer or a decimal. Do not round.)
Solution
Step 1 ：The null hypothesis is a statement in statistical inference which suggests that there is no significant difference between the set of observations and the presumed population. In this case, the null hypothesis would be that the mean body temperature of the animals is equal to $98.3^{\circ} \mathrm{F}$. So, the null hypothesis, denoted as H0, is: H0: μ = 98.3
