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Statistics for Behavioral Sciences Exam 3 Part 4
This deck covers key concepts and questions related to regression equations, chi-square tests, and correlation in the context of behavioral sciences statistics.
Testing the significance of a regression equation is equivalent to testing the significance of the ___.
Pearson correlation
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Key Terms
Term
Definition
Testing the significance of a regression equation is equivalent to testing the significance of the ___.
Pearson correlation
Which of the following could represent a multiple regression equation?
Y = 2X1 + 3X2; A multiple regression equation is one in which Y is related to two different variables, X1 and X2.
The multiple regression equation between Y and two independent variables, X1 and X2, is Y = 1.54X1 + 3.51X2 + 1.17. Predict the Y value if X1 = 5 and X2 = 8.
If X1 = 5 and X2 = 8, then Y = (1.54)(5) + (3.51)(8) + 1.17 = 36.95.
A multiple regression equation with two predictor variables produces R = 0.8. What portion of the variability for the Y scores is predicted by the equation?
64%
A multiple regression equation
Multiple regression provides an alternative procedure for using a partial correlation. Specifically, the regression analysis evaluates the contributio...
Data from a recent study suggests that 61% of the population that buys a certain product is female. In a sample of n = 200 people that purchased this product, 136 were female. What is the expected frequency of male purchasers in this sample?
78
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| Term | Definition |
|---|---|
Testing the significance of a regression equation is equivalent to testing the significance of the ___. | Pearson correlation |
Which of the following could represent a multiple regression equation? | Y = 2X1 + 3X2; A multiple regression equation is one in which Y is related to two different variables, X1 and X2. |
The multiple regression equation between Y and two independent variables, X1 and X2, is Y = 1.54X1 + 3.51X2 + 1.17. Predict the Y value if X1 = 5 and X2 = 8. | If X1 = 5 and X2 = 8, then Y = (1.54)(5) + (3.51)(8) + 1.17 = 36.95. |
A multiple regression equation with two predictor variables produces R = 0.8. What portion of the variability for the Y scores is predicted by the equation? | 64% |
A multiple regression equation | Multiple regression provides an alternative procedure for using a partial correlation. Specifically, the regression analysis evaluates the contribution of each predictor variable after the influence of the other predictor has been considered. Thus, you can determine whether each predictor variable contributes to the relationship by itself or simply duplicates the contribution already made by another variable. |
Data from a recent study suggests that 61% of the population that buys a certain product is female. In a sample of n = 200 people that purchased this product, 136 were female. What is the expected frequency of male purchasers in this sample? | 78 |
What does the chi-square test for independence evaluate? | The chi-square test for independence uses the frequency data from a sample to evaluate the relationship between two variables in the population. Each individual in the sample is classified on both of the two variables, creating a two-dimensional frequency distribution matrix. |
Which of the following tests has a fundamental purpose of evaluating the significance of the relationship between two variables? | I. Chi-square III. Tests of mean difference IV. ANOVA |
Which statistic does the Median Test for Independent Samples rely on? | In a median test for independent samples, the data for a particular variable is grouped into two categories: "Above the Median" and "Below the Median". A matrix is created, and a chi-square statistic is calculated. |
point-biserial correlation | A correlation between two variables where one of the variables is dichotomous (boy vs girl) |