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WorksheetsCorrelation
Total questions: 21
Worksheet time: 13mins
When do we use Pearson's r?
When it is a qualitative variable
When it is an ordinal variable
When it is an Interval and ratio variable
All of the above
When do we use Spearmen's rho?
When it is an qualitative variable
When it is a quantitative variable
When it is an ordinal variable
When it is a ratio and interval variable
What best describe the term "form of the relation"?
Linear
Non-liners
r= -0.87
r^2= 0.36
What does the definition below describe?
Looking for pattern in data that suggests a consistent and predictable relationship
Form of relation
Strength of relation
Direction of relation
Correlation determination
All of the above
What does the definition below describe?
How are changes in one variable related to changes in the other variable?
Form of relation
Direction of relation
Strength of relation
Correlation determinism
All of the above
What best describe the term "direction of relation"?
Negative correlation
Linear
Non linear
Positive correlation
All of the above
What does the definition below describe?
Degree of association between two variables.
Form of relation
Strength of relation
Direction of relation
Coefficient determination
All of the above
The _________ line is the line of best fit.
Regression
Correlation
Coefficient
Shared variance
What do we do to determine what changes in one variable (A) can be attributed to the change in another variable (B)?
Coefficient determinism
Coefficient determination
Shared variance
Shared mean
What is the coefficient determination of the following r?
r= 0.00
100
2
0%
100%
What is the shared variance of the following image?
0
100%
100
0
2
What is the coefficient of determination of the following r?
r= 0.6
(a)
What is df in correlation?
(a)
To be considered statistically significant what does need to happen?
r equal or bigger than p of appropriate df
r bigger than p of appropriate df
r^2 equal or bigger than p of appropriate df
r^2 bigger than p of appropriate df
None of the above
A researcher has observed that children who eat more sugar tend to show a higher level of activity than children who eat less sugar. However, the researcher suspects that the apparent relationship may be explained by the fact that some children have a higher rate of metabolism, which causes them to eat more and to be more active compared to children with a lower rate of metabolism who eat less and are less active. This is an example of the ____.
Directional problem
Spurious variable
Third-variable problem
Extraneous variable problem
Manipulation check problem
Correlation research has what?
Low external validity
High external validity
Low internal validity
High internal validity
The correlation coefficient (r) can range from ___ to ___.
1, 10
1, 100
-1, +1
-10, +100
Unlike an experiment, the limitation of using a correlation is that is cannot establish....
that a relationship exists
causation
the strength of the relationship between 2 variables
the direction of the relationship between 2 variables
Which of the following is the STRONGEST correlation?
-.89
+.82
-.22
+.57
When 2 variables appear to be linked but are actually both being influenced by something else it is called ___
an illusory correlation
a positive correlation
the 3rd variable problem
a negative correlation
which "correlation coefficient effect size" pairs up with the interpretation "medium"?
less than 0.10
0.30-69
0.50 and larger
0.10-0.29
