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Back to 8.1 A Single Population Mean Using the Normal Distribution

8.1 Exercise 16

Avg difficulty 2.5

Use the following information to answer the next five exercises: 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.

What will happen to the confidence interval obtained, if 500 newborn elephants are weighed instead of 50? Why?

OpenStax Statistics, 8.1 A Single Population Mean Using the Normal Distribution, exercise 16

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