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- April 3rd 2009, 08:10 AM #1

- Joined
- Feb 2009
- Posts
- 6

## Please help

Please help. TIA.

- A scatter diagram:

- In which the dependent variable is scaled along the vertical axis.
- In which the dependent variable is scaled along the horizontal axis.
- That portrays the relationship between two variables.
- All of the above

- In correlation analysis

- We consider several independent variables.
- We study the strength of association between two variables.
- We consider the intercept with the Y axis.
- None of the above.

- The sample coefficient of correlation

- Has the same sign as the slope (b)
- Can range form -1.0 to + 1.0
- Is sometimes referred to as Pearson’s r.
- All of the above.

- The coefficient of determination

- Is the square of the coefficient of correlation
- Cannot be negative
- Reports the percent of variation in the dependent variable explained by the independent variable.
- All of the above.

- Consider the following least squares regression equation: Y = 3.5 + 2.1X. Which of the following statements are correct?

- The dependent variable increases 2.1 for an increase of 1 in x.
- The equation crosses the y axis at 3.5
- All of the above
- None of the above

6. Using the equation in problem 5, if the value of the independent variable is 4, what is the value of the dependent variable?

- April 3rd 2009, 03:22 PM #2