In 2008, a small dealership leased 21 Suburu Outbacks on 2-year leases. When the cars were returned in 2010, the mileage was recorded (see below).

1. Find the sample mean with 90% confidence interval.

2. Is the dealer’s mean significantly greater than the national average of 30,000 miles for 2-year leased vehicles, using the 5 percent level of significance?

Find answer using the following steps :

Find answer using the following steps :

Step 1: State the Hypotheses

Step 2: Specify the Decision Rule

Step 3: Calculate the Test Statistic

Step 4: Make the Decision

Calculate p-value also and give interpretations.

Data:

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

 

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