Behavioral Sciences STAT

Mathematics

Quiz 10 :

Describing Relationships Using Correlation and Regression

Quiz 10 :

Describing Relationships Using Correlation and Regression

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What does a correlation coefficient do?
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C

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When the correlation coefficient representing the relationship between X and Y is intermediate, then all of the following are true except
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D

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Dr.Johnston has calculated a correlation between the number of cigarettes smoked per week and the age of his patients at the point of their first heart attack as r = -0.92.Dr.Johnston and his associates claim there apparently is no relationship between smoking and heart attacks.What error has Dr.Johnson made?
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B

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"The more you save, the less you spend" describes
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The best-fitting line through a scatterplot is known as the
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In general, a positive correlation means as the values of one variable ________, there is a tendency for the values of the other variable to ________.
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A linear regression procedure should ultimately yield a value called
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When plotting correlational data, the appropriate graph to use is the
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"The bigger they are, the harder they fall" describes
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If you have a Pearson correlation coefficient of .30, what is the proportion of variance accounted for?
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The values of rho are
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Which of the following r-values indicates the weakest relationship between two variables?
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Which relationship is stronger, r = +0.62 or r = -0.62?
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Professor Miller has found the correlation between a person's "need for affiliation" found by taking a test to determine the need to be with others) and the number of hours spent watching television is −0.69.He should conclude
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Which of the following r-values indicates the strongest relationship between two variables?
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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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A U-shaped pattern is an example of a
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In general, a zero correlation means
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In a linear relationship, as the X scores increase, the Y scores change
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What are the consequences of having a restricted range?
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