HW_10.docx - HW#10 Interpret CI in each of the following problems 1 A sample of 35 luxury hotels in the United States had an average room rate of

# HW_10.docx - HW#10 Interpret CI in each of the following...

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HW#10 Interpret CI in each of the following problems : 1. A sample of 35 luxury hotels in the United States had an average room rate of \$247.80 per night. Using this sample, construct a 90% confidence interval to estimate the average room rate per night for luxury hotels in the United States assuming the population standard deviation is \$39 per night. 2. As a condition of the employment, Home Improvement Industries applicants must pass a drug test. Of the 220, applicants, 14 failed the test. Develop a 90% confidence interval for the proportion of applicants who fail the test. Would it be reasonable to conclude that 5% of the applicants fail the test? 3. Kia Motor Corporation developed the Soul car model to appeal to young consumers. Kia claims the average age of a Soul driver is 24.5 years old. Suppose a random sample of 18 Soul drivers was drawn, and the average age of the drivers was found to be 26.5 years with a standard deviation for the age of soul drivers is 2.3 years. Construct a 95% confidence interval to estimate the average age

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