A Single Population Mean Using the Normal Distribution · Exercise 12
The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The bureau surveys 200 people. The sample mean is 8.2 minutes. There is a known standard deviation of 2.2 minutes. The population distribution is assumed to be normal.
Suppose the Census needed to be 98 percent confident of the population mean length of time. Would the Census have to survey more people? Why or why not?
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OpenStax, Statistics · §8.1 A Single Population Mean Using the Normal Distribution · Exercise 12
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