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1 | |
The estimate for the true population slope, b1, is the ratio of which two values? |
| | A) | SSX /SSY |
| | B) | SSXY/SSX |
| | C) | SSX/SSXY |
| | D) | SSXY/SSX |
| | E) | none of the above |
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2 | |
When there is no linear correlation between two variables, what will the value of r be? |
| | A) | -1 |
| | B) | +1 |
| | C) | 0 |
| | D) | a very small negative number |
| | E) | none of the above |
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3 | |
What is the slope of the line y = -3.4x - 2.5? |
| | A) | -2.5 |
| | B) | 2.5 |
| | C) | -3.4 |
| | D) | 3.4 |
| | E) | none of the above |
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4 | |
An insurance company wants to predict sales from the amount of money they spend on advertising. Which would be the independent variable? |
| | A) | sales |
| | B) | advertising |
| | C) | insufficient information to decide |
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5 | |
Observed errors, which represent information from the data which is not explained by the model, are called? |
| | A) | marginal values |
| | B) | residuals |
| | C) | mean square errors |
| | D) | standard errors |
| | E) | none of the above |
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6 | |
An r value of 0.80 indicates: |
| | A) | no linear correlation at all |
| | B) | perfect linear correlation |
| | C) | correlation, but not linear |
| | D) | some linear correlation |
| | E) | negative linear correlation |
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7 | |
An unbiased estimator for σ2, the variance of the population regression errors, is: |
| | A) | MSE |
| | B) | SSE |
| | C) | s(b1) |
| | D) | s(b0) |
| | E) | SSxy |
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8 | |
The measure of how well the regression line fits the data is the: |
| | A) | coefficient of determination |
| | B) | slope of the regression line |
| | C) | mean square error |
| | D) | standard error of the regression coefficient |
| | E) | s(b0) |
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9 | |
The correlation coefficient, r, can take on any value within what range? |
| | A) | r ≥ 1 |
| | B) | 0 ≤ r ≤ 1 |
| | C) | -1 ≤ r |
| | D) | -1 ≤ r ≤ 1 |
| | E) | any value that the slope of the regression equation can take on |
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10 | |
My estimated regression line is Y = 17 + 4X. The intercept is equal to: |
| | A) | 17 |
| | B) | 4 |
| | C) | 21 |
| | D) | 13 |
| | E) | None of the above |
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11 | |
If two variables have a correlation coefficient of .30, what percentage of one variable is accounted for by the other variable? |
| | A) | 30% |
| | B) | 70% |
| | C) | 10% |
| | D) | 9% |
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12 | |
If you have 20 pairs of subjects what would be the degrees of freedom for a test of correlation between the groups of scores? |
| | A) | 22 |
| | B) | 21 |
| | C) | 20 |
| | D) | 19 |
| | E) | 18 |
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