BUAL 2650 EXAM 2 QUESTIONS & ANSWERS
In a simple linear regression analysis, the correlation coefficient (r) and the slope (b) ... -
Answers :always have the same sign
characteristics off error terms - Answers :- independent
- normally distributed
- mean of 0
- have a constant variance
correlation coefficient is always - Answers :between -1 and 1
If p<alpha, then - Answers :you reject the null hypothesis, not significant
SSE - Answers :residual sum of squares (unexplained)
SSR - Answers :regression Sum of Squares (Explained Variation)
t-test - Answers :test for individual significance
f-test - Answers :test for overall significance
in a simple regression analysis, the quantity that gives the amount by which the Y
(dependent variable) changes for a unit change in X (independent variable) is called
the... - Answers :slope of the regression line
you want r^2 to be... - Answers :as close to 1 as possible
you want SE (standard error) to be... - Answers :small
correlation coefficient - Answers :measures the strength of the linear relationship
between the dependent variable and the independent variable
if the correlation coefficient is -1 - Answers :it is perfectly negative
if the correlation coefficient is 1 - Answers :it is perfectly positive
multiple regression model - Answers :has multiple variables
r-squared - Answers :explained value
r-squared -1 - Answers :unexplained value
SST - Answers :residual regression
In a simple linear regression analysis, the correlation coefficient (r) and the slope (b) ... -
Answers :always have the same sign
characteristics off error terms - Answers :- independent
- normally distributed
- mean of 0
- have a constant variance
correlation coefficient is always - Answers :between -1 and 1
If p<alpha, then - Answers :you reject the null hypothesis, not significant
SSE - Answers :residual sum of squares (unexplained)
SSR - Answers :regression Sum of Squares (Explained Variation)
t-test - Answers :test for individual significance
f-test - Answers :test for overall significance
in a simple regression analysis, the quantity that gives the amount by which the Y
(dependent variable) changes for a unit change in X (independent variable) is called
the... - Answers :slope of the regression line
you want r^2 to be... - Answers :as close to 1 as possible
you want SE (standard error) to be... - Answers :small
correlation coefficient - Answers :measures the strength of the linear relationship
between the dependent variable and the independent variable
if the correlation coefficient is -1 - Answers :it is perfectly negative
if the correlation coefficient is 1 - Answers :it is perfectly positive
multiple regression model - Answers :has multiple variables
r-squared - Answers :explained value
r-squared -1 - Answers :unexplained value
SST - Answers :residual regression
