Answer:
The 99% confidence interval for the mean number of admissions per 24 dash hour period is between 14.7 and 16.9.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 15.8 - 1.1 = 14.7.
The upper end of the interval is the sample mean added to M. So it is 15.8 + 1.1 = 16.9.
The 99% confidence interval for the mean number of admissions per 24 dash hour period is between 14.7 and 16.9.