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Answer :
The test statistic in this problem is given as follows:
z = -3.86.
As the absolute value of the test statistic is greater than the critical value of z* = 1.96, there is enough evidence to reject the claim regarding the body temperature of the population.
How to calculate the test statistic?
The equation for the test statistic in this problem is given as follows:
[tex]z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]
In which:
- [tex]\overline{x}[/tex] is the sample mean.
- [tex]\mu[/tex] is the value tested at the null hypothesis.
- [tex]\sigma[/tex] is the standard deviation of the population.
- n is the sample size.
The parameters for this problem are given as follows:
[tex]\overline{x} = 98.3, \mu = 98.5, \sigma = 0.5, n = 93[/tex]
Hence the test statistic is given as follows:
[tex]z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]
[tex]z = \frac{98.3 - 98.5}{\frac{0.5}{\sqrt{93}}}[/tex]
z = -3.86.
More can be learned about the z-distribution at https://brainly.com/question/25890103
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