Running head: PHYSICAL ACTIVITY, INTENSITY, AND ATTENTIONAL BIAS
ARTICLE REVIEW
Self-Regulating Smoking and Snacking Through Physical Activity
Randy Vollrath
PSY 410 Advanced Statistics 1
November 15th, 2013
1
Self-Regulating Smoking and Snacking Through
Source
SS
Between Gps
df
1
252
MS
252
Error
2949
18
Total
3201
164
19
F = 252/164 = 1.54
The critical cut-off F for 1,18 df with =.05 is 4.41
Therefore, we fail to reject H0 and we conclude that the mean test scores for the two
conditions are not signi
Of the overall SS(T), which was 3201,
After you remove the part of it that is predictable based on IQ,
You still have 1661.3 of the SS(T) that is not accounted for
You have just partialled out the effect of the covariate from the Total SS.
Having adj
Source
SS
df
Bet Groups
172.11 2
86.06
Error
666.83 15
Total
MS
F
1.94
44.46
838.94 17
So, why is this NS?
- means
- within-group variability
What if theres some third variable affecting things?
Lets see how this might work.
In a normal experiment, we
Power, Errors, Effect Size, N, and
Inferences about causality depend on control of extraneous variables.
Theres nothing sacred about .05 as a significance level.
Decisions about the null hypothesis can be wrong. So, were about to look at the
intersecti
We also want to be able to conclude that there is a significant effect when there really is
one. Go back to the table:
The ability of a test to correctly reject H0 when H0 is in fact untrue is the power of
the test.
We want to be able to reject H0 when we
Advanced Statistics I Journal Article Review Assignment
Find an article in a peer-reviewed journal that uses one of the statistical analyses being taught
in this class (e.g., one-way ANOVA, ANCOVA, factorial ANOVA, repeated-measures ANOVA,
mixed ANOVA). P
Advanced Statistics I
Journal Article Review Assignment
Find an article in a peer-reviewed journal that uses one of the statistical analyses being taught in
this class (e.g., one-way ANOVA, ANCOVA, factorial ANOVA, repeated-measures ANOVA,
mixed ANOVA). P
Running head: PHYSICAL ACTIVITY, INTENSITY, AND ATTENTIONAL BIAS
ARTICLE REVIEW
Self-Regulating Smoking and Snacking Through Physical Activity
Randy Vollrath
PSY 410 Advanced Statistics 1
November 15th, 2013
1
Self-Regulating Smoking and Snacking Through
Running head: PHYSICAL ACTIVITY, INTENSITY, AND ATTENTIONAL BIAS
ARTICLE REVIEW
Self-Regulating Smoking and Snacking Through Physical Activity
Randy Vollrath
PSY 410 Advanced Statistics 1
November 15th, 2013
1
Self-Regulating Smoking and Snacking Through
Analysis of Covariance
(ANCOVA)
Psychology 410
Advanced Statistics I
What is a covariate?
How is it related to other concepts?
Variance
Covariance
Correlation
Examples of covariates
Partialling out effects on error variance
How do we select potential