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). 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?

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

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.