Tony Stark is trying to improve his Iron Man suit by increasing its power. One modification will cost $350 million, of which the
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Using the z-distribution, as we have the standard deviation for the population, to test the hypothesis, it is found that this is evidence that workers in the large city take longer than 28 minutes to get home from work.
<h3>What are the hypothesis tested?</h3>At the null hypothesis, it is tested if the mean time is of 28 minutes, that is:
At the alternative hypothesis, it is tested if the mean time is greater than 28 minutes, that is:
.
The test statistic is given by:
The parameters are:
is the sample mean.
is the value tested at the null hypothesis.
is the standard deviation of the sample.
- n is the sample size.
In this problem, the values of the parameters are given by:
Hence:
Considering that we have a <em>right-tailed test</em>, as we are testing if the mean is greater than a value, with a standard <em>significance level of 0.05</em>, the critical value is of .
Since the test statistic is greater than the critical value, it is found that this is evidence that workers in the large city take longer than 28 minutes to get home from work.
To learn more about the z-distribution, you can check brainly.com/question/26454209