Exam 18: Correlation and Regression

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________ derives a mathematical equation in the form of a straight line between a single metric criterion variable and a single metric predictor variable.

(Multiple Choice)
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To standardize a variable,simply subtract the mean and divide the difference by the standard deviation.

(True/False)
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The term used to denote the standardized regression coefficient is called the ________.

(Multiple Choice)
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The r² statistic measures the proportion of variation in one variable that is explained by the other.

(True/False)
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The difference between the observed value of Y and the value predicted by the regression equation is called the standard error.

(True/False)
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To estimate the accuracy of predicted values,it is useful to calculate the ________.

(Multiple Choice)
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R² cannot decrease as more independent variables are added to the regression equation.

(True/False)
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A systematic relationship between two variables in which a change in one implies a corresponding change in the other is called covariance.

(True/False)
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The distances for all the points on the regression line are squared and added together to compute the ________,which is a measure of total error.

(Multiple Choice)
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The correlation coefficient between two variables varies depending on their underlying units of measurement.

(True/False)
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The covariance may be either positive or negative.

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The covariance correlation is the most widely used statistic that summarizes the strength and direction of association between two metric variables.

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An equation used to explain the results of multiple regression analysis is called the multiple regression model.

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Questionnaire development is a step involved in conducting bivariate regression analysis.

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When data are standardized,the intercept assumes a value of one.

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According to the text,the beta coefficient is also called the ________.

(Multiple Choice)
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________ involves testing the significance of the overall regression equation as well as specific partial regression coefficients.

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Which of the following is (are)true?

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A scatter diagram is a plot of the values of two variables for all the cases or observations.

(True/False)
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________ is a statistical technique that simultaneously develops a mathematical relationship between two or more independent variables and an interval-scaled dependent variable.

(Multiple Choice)
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