The standard deviation of the weights of elephants is known to
be approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants are weighed. The sample mean is 244 pounds. The
sample standard deviation is 11 pounds.
Construct a 95% confidence interval for the population mean weight
of newborn elephants. State the confidence interval. (Round your
answers to two decimal places.)
,
Sketch the graph. (Round your answers to two decimal places.)
CL = 

Calculate the error bound. (Round your answer to two decimal places.)
Here 244 , , n = 50
Confidence interval for the population mean =
Confidence interval = 95%
Therefore, Z = 1.96
95% confidence interval for population mean
Graph
Error bound =
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