| Comparing
amount of time spent watching TV per day by age group.
Analysis
of Variance (ANOVA): TVHOURS (Means) by AGECAT4 (Groups)
Independent
Variable Label: Age categories
Dependent
Variable Label: Hours watch TV per day
Group
Summary Statistics
Group
N
Mean Std. Dev.
--------------------------------------------------------------
18-29 185 3.0108 2.2698
30-39 243 2.6008 2.0331
40-49 198 2.5859 1.7712
50+ 364 3.2665 2.6385
Analysis
of Variance
Sum of Squares
df Mean
Squares
--------------------------------------------------------------
Between
Groups
92.09
3 A 30.70 B
Within Groups
5093.45
986
C
5.17 D
Total 5185.54
989 E
F Statistic
p <
-----------------------------
5.94 F 0.0005 G
A k-1, where k = 4 group means
B Between Groups Sum of Squares ÷ degrees of
freedom
C n-k, where n = 990
D Within Groups Sum of Squares ÷ degrees of
freedom
E n-1
F Between Groups Mean Squares ÷ Within Groups
Mean Squares
G The F-Statistic is statistically significant. The p-value represents the probability of making a
type 1 error (concluding there is statistical significance when there is none). Since there is about .05% (p < .0005) chance of
making a type 1 error, you conclude there is statistical significance; ie, there is
variation among the groups.
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