During special events, such as Mavericks games, or Cowboys games, policemen are
ID: 3320577 • Letter: D
Question
During special events, such as Mavericks games, or Cowboys games, policemen are assigned to various intersections to speed up the flow of traffic and reduce congestion. To determine if there were any differences among the three busiest intersections needing police supervision, the number of vehicles passing through each of the three intersections was recorded for a 30 minute period over the course of six special event occasions. (Assume normal distributions with equal variances.) *note: the word "intersection" has been abbreviated.
An Anova One-Way test , at the 5% significance level, was run on this data with the following results obtained:
Anova: Single Factor
SUMMARY
Groups
Count
Sum
Average
Variance
Intersectn 1
6
2690
448.3333
2416.667
Intersectn 2
6
2710
451.6667
2776.667
Intersectn 3
6
2460
410
1610
ANOVA
Source of Variation
SS
df
MS
F
P-value
F crit
Between Groups
6433.333
2
3216.667
1.418422
0.272
3.68
Within Groups
34016.67
15
2267.778
Total
40450
17
What is the number of treatments?
3
2
4
none of the above
Anova: Single Factor
SUMMARY
Groups
Count
Sum
Average
Variance
Intersectn 1
6
2690
448.3333
2416.667
Intersectn 2
6
2710
451.6667
2776.667
Intersectn 3
6
2460
410
1610
ANOVA
Source of Variation
SS
df
MS
F
P-value
F crit
Between Groups
6433.333
2
3216.667
1.418422
0.272
3.68
Within Groups
34016.67
15
2267.778
Total
40450
17
Explanation / Answer
Number of treatments = Between group degrees of freedom + 1
Here,
Between group degrees of freedom = 2
Hence,
Number of treatments = 2 + 1 = 3
Option A is correct.
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