Refer to Exercise 5.52.
In exercise

The lobbyist for the business group has his expert examine the ­experimental equipment and determines that measurement errors may have been made when recording the reaction times. Unless the difference in reaction time is at least .25 seconds, the expert claims that the two times are essentially equivalent.
a. Is there sufficient evidence that the median difference in reaction times is greater than .25 seconds?
b. What other factors about the drivers are important in attempting to decide whether moderate consumption of alcohol affects reaction time?

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