1) What is the null hypothesis of the test that there is no difference in fuel efficiency between the types of cars?

A.

All three means of fuel efficiency are different for the three types of cars

B.

At least one mean of fuel efficiency differs from the means of the other two types of cars

C.

All means of fuel efficiency are equal for the three types of cars

D.

All medians of fuel efficiency are equal for the three types of cars

2) What is the alternative hypothesis of the test that there is no difference in fuel efficiency between the types of cars?

A.

At least one mean of fuel efficiency differs from the means of the other two types of cars

B.

All means of fuel efficiency are equal for the three types of cars

C.

All three means of fuel efficiency are different for the three types of cars

D.

All medians of fuel efficiency are equal for the three types of cars

3) Create side-by-side boxplots in StatCrunch. What type of car has highest variability in fuel efficiency (judge by the graph, do not calculate)?

A.

Trucks

B.

SUVs

C.

Passenger cars

4) And again looking at the side-by-side boxplot only, without yet doing any calculations: do you expect to find significant differences in mean fuel efficiency between the types of cars?

A.

Yes, because differences in medians are small relative to the amount of variation within each type.

B.

No, because differences in medians are small relative to the amount of variation within each type.

C.

Yes, because differences in medians are small.

D.

No, because differences in medians are small