A numerical index that reflects the relationship between two variables with the removal of the influence of a third variable is called
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Correct Answer:
Partial correlation
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Coefficient of alienation is coefficient of nondetermination
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Correct Answer:
True
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Coefficient of alienation is the amount of variance in one variable that is not accounted for by the variance in another variable.
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Correct Answer:
True
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Coefficient of determination is the amount of variance in one variable that is accounted for by the variance in another variable.
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Correct Answer:
True
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A table showing correlation coefficients among more than two variables is called
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Correlation matrix
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A correlation that is best expressed visually as a straight line is called
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Linear correlation
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In which plot of paired data points on an x-axis and a y-axis, used to visually represent a correlation?
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Correct Answer:
Scattergram
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Scatter plot is of paired data points on an x-axis and a y-axis, used to visually represent a correlation.
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Correct Answer:
True
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A ____ correlation where the values of variables move in opposite directions.
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Negative
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A negative correlation where the values of variables move in opposite direction is called
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Indirect correlation
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Direct correlation is ____ correlation
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Positive
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A positive correlation where the values of both variables change in the same direction is called
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Direct correlation
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Correlation coefficient that reflects the relationship between two variables, specifically how the value of one variable changes when the value of the other variable changes.
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Correct Answer:
True
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In which index correlation coefficient that reflects the relationship between two variables?
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Numerical
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We should do a scatterplot of the data when we compute a correlation because the scatterplot allows us to ______.
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See the relationship between the two variables
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To know whether there is a relationship between two variables, you draw a line around the outer edges of a scatterplot. If there is a negative relationship, ______.
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The scatterplot is elliptical and is slanted downward (left to right)
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Which of the following refers to a correlation between two variables?
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Bivariate
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In a correlational analysis, N stands for the ______.
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Total number of pairs of scores
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The best-fitting line through a scatterplot is known as the ______.
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Regression line
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Correlation coefficients are used to describe what?
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A group
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When plotting correlational data, the appropriate graph to use is the ______.
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Scatterplot
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When looking at how one variable changes another variable, which of the following descriptive statistics would you want to use?
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Correlation
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In general, a positive correlation means that as the values of one variable ______, there is a tendency for the values of the other variable to ______.
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Increase; increase
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If we calculate a correlation coefficient and we find that there is a relationship between the two variables, we ______.
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Cannot conclude that changes in one variable cause changes in the other variable
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A ______ variable comes between two variables of interest and explains the apparent relationship and a ______ variable affects both our variables of interest and explains the correlation between them.
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Mediating; confounding
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In an experimental design ______, whereas in a correlational design ______.
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Researchers assign each person an X score and then measure the score on the Y variable; researchers measure scores on variables that a participant has already experienced
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What does a correlation coefficient do?
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It quantifies the pattern in a relationship.
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Using a correlational design, a researcher found a relationship between the healthiness of one’s heart and the amount of fish oil in one’s diet. The researcher should conclude that ______.
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Although a relationship exists, one cannot infer that changes in one variable are causing changes in the other variable
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In general, a negative correlation means that as the values of one variable ______, there is a tendency for the values of the other variable to ______.
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Correct Answer:
Increase; decrease
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