Question

1. In 2016, a small dealership leased 21 Subaru Outbacks on 2-year leases. When the cars were returned in 2018, the mileage was recorded (see below). The data may be found in the file named “xlsx,” which is posted on Canvas under Modules under Chapter 9 Textbook Data files. Download the data file from Canvas, open in Excel, then copy and paste to Minitab.

40,060	24,960	14,310	17,370	44,740	44,550	20,250
33,380	24,270	41,740	58,630	35,830	25,750	28,910
25,090	43,380	23,940	43,510	53,680	31,810	36,780

• a. Using the 10 percent level of significance, is the dealer's mean significantly greater than the national average of 30,000 miles for 2-year leased vehicles? Follow and show the 7 steps for hypothesis testing. (8 points)
• b. Determine the p-value and interpret its meaning. (3 points)
• c. What assumption must you make about the population distribution in order to conduct the test in part a? Is the assumption valid? Use and include an appropriate graph from Minitab. Write a couple of sentences supporting your answer. (5 points)
• d. Verify your results (in parts a - c) using Minitab. (2 points)

Answer 1

Solution: