What does 1 - r^2 measure?
a. The relative importance of all other possible predictor variables on y.
b. The percentage of points that are on the regression line.
c. The percentage of points that are off the regression line
Answer: a. The relative importCorrelation and Regression Analysisance of all other possible predictor variables on y.
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Correlation and Regression Analysis
- Which of the following statements is not correct regarding the correlation.
- The primary purpose of a regression equation is to
- The ratio of SS(Regression) divided by the SS(Total) is also called the
- Which of the following is not based on a correlation or a regression line relating y to x?
- The percentage of variance accounted for
- The standard error is
- A regression equation is used to predict women's Weight (in pounds) from their Height (in inches). The correlation between Weight (W) and Height (H) turned out to be 0.70 . The average H was 64 inches and the average W was 119.6 pounds.
- In a regression problem, n=207 and SS(Residual)=0. Find the correlation coefficient.
- What is the formula for the correlation coefficient in terms of the cov?
- The coefficient of correlation was computed to be -0.60. This means
- We obtained the following regression equation: y(hat) = 3.5 + 2.1x.. Which of the following statements are correct?
- The coefficient of correlation.
- In a regression problem, n=52, SS(Total)=400, and r = -0.8367 Find the Standard Error.
- Find the intercept and slope of the regression line to predict Y from X.
- The correlation between X=person's weight and Y=person's height is 0.70 . What is the correlation for the same data set if we had used X=person's height and Y=person's weight?
- Compute the correlation r: Given: (E)X=40, (E)Y=20, (E)XY=300, (E)X2=580, (E)Y2=400, n=10.
- An Inverse Relationship means the trendline will have a _______ slope.
- If all the points are on the regression line, then
- A correlation of 0.02 would indicate:
- In a regression problem, the slope = 0.40 The mean and standard deviation of the X variable are both 100. The mean and standard deviation of the Y variable are both 200. Find the correlation r.
- Here is an Excel printout of a regression problem. Use this for the following 4 questions.
- What is the difference between (beta)1 and b1 ?
- R-Square values can range from _____ to ______.
- If the p-value (for the slope) on a regression printout = 0.00001 then