2. You are thinking about buying a motel located on Interstate 64. Before you make up your mind, you want to estimate the average number of vehicles that go by the motel each day in the summer....

#2

Extracted text: 2. You are thinking about buying a motel located on Interstate 64. Before you make up your mind, you want to estimate the average number of vehicles that go by the motel each day in the summer. Fortunately, the highway department has been counting vehicles on I-64 near the motel. A random sample of 36 summer days shows an average of 16000 cars per day with a standard deviation of 2400 cars. Find a 90% confidence interval for the mean number of cars per summer day going past the motel. 3. A sociologist is studying marriage customs in a rural community in Denmark. A random sample of 35 women who have been married was used to determine the age of the woman at the time of her first marriage. The sample standard deviation was 2.3 years. How many women should be included in the sample to be 95% confident that the sample mean of ages is within .25 year of the population mean?