Some studies show that people who think they are intoxicated will show signs of
ID: 3360205 • Letter: S
Question
Some studies show that people who think they are intoxicated will show signs of intoxication, even if they did not consume alcohol. To test whether this is true, researchers had a group of five adults consume nonalcoholic drinks, which they were told contained alcohol. The participants completed a standard driving test before drinking and then after one nonalcoholic drink and after five nonalcoholic drinks. A standard driving test was conducted in a school parking lot where the participants had to maneuver through traffic cones. The number of cones knocked over during each test was recorded. The following table lists the data for this hypothetical study.
(a) Complete the F-table. (Round your answers to two decimal places.)
(b) Compute a Bonferroni procedure and interpret the results. (Assume experimentwise alpha equal to 0.05. Select all that apply.)Students knocked over significantly more cones after 5 nonalcoholic drinks compared with the driving test prior to drinking.There were no significant differences between any of the groups.Students knocked over significantly more cones after 5 nonalcoholic drinks compared with the driving test after 1 nonalcoholic drink.Students knocked over significantly more cones after 1 nonalcoholic drink compared with the driving test prior to drinking.
Drinking After One
Drink After Five
Drinks 0 1 3 0 1 3 1 2 3 3 2 5 0 2 0
Explanation / Answer
Result:
(a) Complete the F-table. (Round your answers to two decimal places.)
Analysis of Variance
Source
DF
Adj SS
Adj MS
F-Value
P-Value
sub
4
12.267
3.067
2.88
0.095
grp
2
10.133
5.067
4.75
0.044
Error
8
8.533
1.067
Total
14
30.933
(b) Compute a Bonferroni procedure and interpret the results. (Assume experimentwise alpha equal to 0.05. Select all that apply.)
Bonferroni Simultaneous Tests for Differences of Means
Difference
of grp
Levels
Difference
of Means
SE of
Difference
Simultaneous
95% CI
T-Value
Adjusted
P-Value
2 - 1
0.800
0.653
(-1.170, 2.770)
1.22
0.767
3 - 1
2.000
0.653
(0.030, 3.970)
3.06
0.047
3 - 2
1.200
0.653
(-0.770, 3.170)
1.84
0.311
Individual confidence level = 98.33%
Answer: Students knocked over significantly more cones after 5 nonalcoholic drinks compared with the driving test prior to drinking.
There were no significant differences between any of the groups
.Students knocked over significantly more cones after 5 nonalcoholic drinks compared with the driving test after 1 nonalcoholic drink.
Students knocked over significantly more cones after 1 nonalcoholic drink compared with the driving test prior to drinking.
Source
DF
Adj SS
Adj MS
F-Value
P-Value
sub
4
12.267
3.067
2.88
0.095
grp
2
10.133
5.067
4.75
0.044
Error
8
8.533
1.067
Total
14
30.933
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