Five people who were convicted of speeding were ordered by the court to attend a workshop. The maximum speeds for each participant during the two weeks before and the two weeks after the workshop are shown to the right. Using the 0.05 significance level, should it be concluded that people are likely to drive more slowly after such a workshop? Complete parts (a) through (c).

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Participant	Before	After
A	64		57
B	63		66
C	59		57
D	70		65
E	67		59

Question content area bottom

Part 1

(a) Use the steps of hypothesis testing. Determine the null hypothesis. Choose the correct answer below.

A.

The mean difference speed

(AfterBefore)

for drivers that attend such workshops is not less than the mean difference speed for drivers that do not attend such workshops and whose maximum speeds are unaffected by such workshops.

B.

The mean of the maximum speeds before the drivers attended the workshop is greater than the mean of the maximum speeds after the drivers attended the workshop.

C.

The mean difference speed

(AfterBefore)

for drivers that attend such workshops is less than the mean difference speed for drivers that do not attend such workshops and whose maximum speeds are unaffected by such workshops.