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1. n a scatter diagram the independent variable is always scaled on the axis 2.

ID: 3326057 • Letter: 1

Question

1. n a scatter diagram the independent variable is always scaled on the axis 2. A strong positive correlation between two variables is considered a value between 3. Which value indicates the weakest correlation? (0.68, 0.72, 0.05, -0.99). 4. True or False: The correlation coefficient can never be negative. Given the following Regression Equation: 0.92 then answer the following: 36 + 0.6x and the coefficient of determination is a. b. C. At what value does the regression line cross the y axis? What is the correlation coefficient? An increase of 3 units in the independent variable will result in what amount of increase in the dependent variable? What is the estimated Y value when x is -10? d. 6. Which is not true: The standard error of estimate measures the variation around the regression line. A standard error of estimate that is large indicates points that cluster tightly to a regression line The standard error of estimate is the square root of the mean squared differences between the predicted and actual value of y The standard error of estimate is in the same units as the dependent variable a. b. C. d. 7. The prediction interval will always be (WIDER or NARROWER) than the confidence interval for a given value of X. 8. On the first statistics exam, the coefficient of determination between the hours studied and the grade earned was 90%. The standard error of estimate was 9, There were 25 students in the class. Develop an ANOVA table for the regression analysis of hours studied as a predictor of the grade earned on the first statistics exam. Source DF MS Regression Error Total

Explanation / Answer

1). Answer: independent variable is always sclaed on X -axis

2). Answer: ranges from 0.7 to 1.0

3). Answer: weakesst correlation value is 0.05

4). Answer: False

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