A Single Population Mean Using the Normal Distribution · Exercise 4
The standard deviation of the weights of elephants is known to be approximately 15 lb. We wish to construct a 95 percent confidence interval for the mean weight of newborn elephant calves. Fifty newborn elephants are weighed. The sample mean is 244 lb. The sample standard deviation is 11 lb.
Construct a 95 percent confidence interval for the population mean weight of newborn elephants. State the confidence interval, sketch the graph, and calculate the error bound.
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OpenStax, Statistics · §8.1 A Single Population Mean Using the Normal Distribution · Exercise 4
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