MC: Simple Linear Regression (II)

Question 1

What is the regression coefficient t-test used for?

Answer 1

To test individual coefficients to determine if they are different from 0. Attached example

Question 2

What is the formula regression coefficient t test statistic?

Answer 2

Question 3

What do the components of a regression coefficient t test mean?

Answer 3

Question 4

Describe prediction intervals.

Answer 4

Space of confidence that you will see all Y outcomes- including the noise and all sources of randomness.

Question 5

Describe the standard error of the forecast.

Answer 5

The total of residual error and sampling error creating a range around the Y values.

Question 6

What is the formula for creating a prediction range using standard error of forecast?

Answer 6

Question 7

How are the predicted Y values calculated for creating a prediction interval?

Answer 7

B-not, B-one and the X-value need to be placed in equation.

Question 8

What is the dependent variable for Log-Lin, Lin-Log, Log-Log?

Answer 8

Question 9

What are the independent variables for Log-Lin, Lin-Log, Log-Log?

Answer 9

Question 10

Give slope interpretations for Log-Lin, Lin-Log, Log-Log.

Answer 10

Question 11

When adjusting or transforming variables , with relation to linear regression- what 3 things should b checked for?

Answer 11

1. Increased r squared
2. Increased f stat
3. Decreased SEE