In the year 2000 the average car had a fuel economy of 219 M

In the year 2000, the average car had a fuel economy of 21.9 MPG. You are curious as to whether the average in the present day is greater than than the historical value. What are the appropriate hypotheses for this test?

A. H0: =21.9HA: =21.9

B. H0: 21.9HA: <21.9

C. H0: >21.9HA: 21.9

D. H0: 21.9HA: >21.9

E. H0: <21.9HA: 21.9

Solution

Set Up Hypothesis
Null, average in the present day is less than or equal to historical value H0: U<=21.9
Alternate, average in the present day is greater than than the historical value H1: U>21.9

ANS:
D. H0: 21.9HA: >21.9