Answer:
The 99% confidence interval for the population mean is between 140.54 minutes and 151.46 minutes
Step-by-step explanation:
We have that to find our [tex]\alpha[/tex] level, that is the subtraction of 1 by the confidence interval divided by 2. So:
[tex]\alpha = \frac{1-0.99}{2} = 0.005[/tex]
Now, we have to find z in the Ztable as such z has a pvalue of [tex]1-\alpha[/tex].
So it is z with a pvalue of [tex]1-0.005 = 0.995[/tex], so [tex]z = 2.576[/tex]
Now, find the margin of error M as such
[tex]M = z*\frac{\sigma}{\sqrt{n}}[/tex]
In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.
[tex]M = 2.576*\frac{9}{\sqrt{18}} = 5.46[/tex]
The lower end of the interval is the sample mean subtracted by M. So it is 146 - 5.46 = 140.54 minutes
The upper end of the interval is the sample mean added to M. So it is 146 + 5.46 = 151.46 minutes
The 99% confidence interval for the population mean is between 140.54 minutes and 151.46 minutes
