Bivariate Correlational Research

19 important questions on Bivariate Correlational Research

What kind of validity has to do with the following question; how well does the data support the conclusion?

statistical validity

What kind of validity has to do with the following question; how well was the experiment conducted, are there alternative explanations for the statistical effect?

internal validity.

How do we call the concept that describes the strength of a relationship between two or more variables?

the effect size.
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What are the properties of larger effect sizes?

  • allow more accurate predictions
  • are more important.

How do we call the conclusion that's been made regarding the likelihood of getting a correlation of this size just by chance, assuming there is no correlation in the real world?

statistical significance.

Why are outliers problematic?

they can influence r and therefor be a threat to external validity.

When is an outlier especially problematic?

when the person scored high on both variables.

How do we call the situation where there's not a full range of scores on one of the variables, in the association which can make the correlation appear smaller than it actually is?

restriction of range.

How do we call a correlation that is in fact not linear but forms a parabool?

a curvilinear association.

What is the statistical valid way to analyze a curvilainear association?

compute the correlation between one variable, and the square of another.

What are the three criteria a study has to satisfy to establish causality?

  • covariance of cause and effect
  • temporal presedence
  • internal validity.

Which causal criteria of a study is described; the results must show a correlation or association between the cause- and effect variable.

covariance of cause and effect.

Which causal criteria of a study is described; the cause variable must precede the effect variable.

temporal precedence

How is the temporal precedence criterion sometimes called?

the directionality problem.

How is the third validity criterion often called?

the third variable problem.

What is necessary for the third variable problem to occur?

the third variable must correlate logically with both of the measured variables.

How do we call the phenomenon that occurs when a bivariate correlation is present, but only because of some third variable?

a spurious association.

How can you show in a scatterplot that a potential third variable isn't a threat to internal validity?

if there're still relationships between the initial two variables for both levels of the categorical third variable.

How do we call a third variable of which level the relationship between two variables depend?

a moderator.

The question on the page originate from the summary of the following study material:

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