Many states have attempted to reduce the blood alcohol level at which a driver is declared to be legally drunk. There has been resistance to this change in the law by certain business groups who have argued that the current limit is adequate. A study was conducted to demonstrate the effect on the reaction time of a blood-alcohol level of .1%, the current limit in many states. A random sample of 25 persons of legal driving age had their reaction time recorded in a standard laboratory test procedure before and after drinking a sufficient amount of alcohol to raise their blood alcohol to a .1% level. The difference (After − Before) in their reaction times in seconds was recorded as follows: 0.01 0.02 0.04 0.05 0.07 0.09 0.11 0.26 0.27 0.27 0.28 0.28 0.29 0.29 0.30 0.31 0.31 0.32 0.33 0.35 0.36 0.38 0.39 0 .39 0.40 Graph the data and assess whether the population has a normal distribution. Is there sufficient evidence that a blood-alcohol level of .1% causes any increase in the mean reaction time?
Many states have attempted to reduce the blood alcohol level at which a driver is declared to be legally drunk. There has been resistance to this change in the law by certain business groups who have argued that the current limit is adequate. A study was conducted to demonstrate the effect on the reaction time of a blood-alcohol level of .1%, the current limit in many states. A random sample of 25 persons of legal driving age had their reaction time recorded in a standard laboratory test procedure before and after drinking a sufficient amount of alcohol to raise their blood alcohol to a .1% level. The difference (After − Before) in their reaction times in seconds was recorded as follows:
0.01 0.02 0.04 0.05 0.07 0.09 0.11 0.26 0.27 0.27 0.28 0.28 0.29 0.29 0.30 0.31 0.31 0.32 0.33 0.35 0.36 0.38 0.39 0 .39 0.40
- Graph the data and assess whether the population has a
normal distribution . - Is there sufficient evidence that a blood-alcohol level of .1% causes any increase in the mean reaction time?
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