CH14 Relationships/More Powerful Statistical Methods

Question 1

what are bivariate analyses used for?

Answer 1

bivariate analyses are used to analyze the relationship between 2 variables

Question 2

define an independent variable

Answer 2

independent variable: a variable believed to affect the value of the dependent variable

Question 3

what is the dependent variable?

Answer 3

the dependent variable is the variable expected to be explained or caused by the independent variable

Question 4

define the bivariate regression analysis

Answer 4

bivariate regression analysis: analysis of the strength of the linear relationship between 2 variables when 1 is considered the independent variable and the other the dependent variable

Question 5

what is the equation for a straight line fitted to 2 variables?

Answer 5

the equation for a straight line fitted to 2 variables is
Y = a + bX

Question 6

what does the coefficient of determination (R2) measure?

Answer 6

the coefficient of determination (R2) measures the percentage of the total variation in the dependent variable explained by the variation in the independent variable

Question 7

what is correlation analysis?

Answer 7

correlation analysis measures the degree to which changes in one variable are associated with changes in another

Question 8

what is multivariate analysis?

Answer 8

multivariate analysis refers to the simultaneous analysis of multiple measurements on each individual or object being studied

Question 9

what is multiple regression analysis used for?

Answer 9

multiple regression analysis is used to predict the magnitude of a dependent variable based on the levels of multiple independent variables