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A random sample of 10 independent healthy people showed the body temperatures given below (in degrees Fahrenheit). Test the hypothesis that the population mean is not [tex]$98.6^{\circ} F$[/tex], using a significance level of 0.05.

[tex]
\begin{array}{llllllllll}
98.2 & 98.5 & 99.0 & 96.8 & 98.2 & 98.5 & 97.8 & 99.3 & 98.6 & 97.6
\end{array}
[/tex]

Determine the null and alternative hypotheses. Choose the correct answer below.

A. [tex]H_0: \mu=98.6[/tex]
B. [tex]H_0: \mu\ \textgreater \ 98.6[/tex]
C. [tex]H_0: \mu\ \textless \ 98.6[/tex], [tex]H_a: \mu\ \textgreater \ 98.6[/tex], [tex]H_a: \mu=98.6[/tex]
D. [tex]H_a: \mu=98.6[/tex]
E. [tex]H_0: \mu \neq 98.6[/tex]
F. [tex]H_0: \mu=98.6[/tex], [tex]H_a: \mu=98.6[/tex], [tex]H_a: \mu\ \textless \ 98.6[/tex], [tex]H_a: \mu \neq 98.6[/tex]

Answer :

We are asked to test if the population mean body temperature is different from [tex]$98.6^\circ F$[/tex]. This is a two-tailed test where the null hypothesis states that the mean equals [tex]$98.6^\circ F$[/tex], while the alternative hypothesis states that the mean is not equal to [tex]$98.6^\circ F$[/tex].

The hypotheses are therefore formulated as follows:

[tex]$$
H_0: \mu = 98.6 \quad \text{(The mean body temperature is } 98.6^\circ F\text{)}
$$[/tex]

[tex]$$
H_a: \mu \neq 98.6 \quad \text{(The mean body temperature is not } 98.6^\circ F\text{)}
$$[/tex]

Given the multiple choice options, the correct answer is the one which presents the null hypothesis as [tex]$\mu=98.6$[/tex] and the alternative as [tex]$\mu\neq98.6$[/tex]. This corresponds to option F.

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