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Yanka [14]
3 years ago
14

A mean equal to 5 cm. A simple random sample of wrist breadths of 40 women has a mean of 5.07

Mathematics
1 answer:
neonofarm [45]3 years ago
5 0

Answer:

The value of the test statistic is z = 1.34

Step-by-step explanation:

The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

Test if the mean is equal to 5:

This means that the null hypothesis is \mu = 5

A simple random sample of wrist breadths of 40 women has a mean of 5.07 cm. The population standard deviation is 0.33 cm.

This means that n = 40, X = 5.07, \sigma = 0.33

Find the value of the test statistic?

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{5.07 - 5}{\frac{0.33}{\sqrt{40}}}

z = 1.34

The value of the test statistic is z = 1.34

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