Answer:
The 95% confidence interval for the population mean weight of newborn elephants is between 242.12 pounds and 245.88 pounds.
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 244 - 1.88 = 242.12 pounds.
The upper end of the interval is the sample mean added to M. So it is 244 + 1.88 = 245.88 pounds
The 95% confidence interval for the population mean weight of newborn elephants is between 242.12 pounds and 245.88 pounds.