ST DELKURS 2 TENTA

Question 1

The number of degrees of freedom for the appropriate chi-squared distribution in a test of independence is

Answer 1

A. n-1
B. k-1
C. number of rows minus 1 times number of columms minus 1 (RÄTT SVAR)
D. a chi-squared distribution is not used
E. None of these alternatives is correct

Question 2

In regression analysis, the variable that is being predicted is the

Answer 2

a. Dependent variable (RÄTT SVAR)
b. independent variable
C. intervening variable
D. is usually X
E. None of these alternatives is correct

Question 3

In a regression model involving more than one independent variable, which of the following tests must be used in order to determine if the relationship between the dependent variable and at least one of independent variables is significant?

Answer 3

A. t test
B. F test (RÄTT SVAR)
C. Either a t test or a chi-square test can be used
D. chi-square test
e. none of these alternatives is correct

Question 4

Correlation analysis is used to determine

Answer 4

A. the equation of the regression line
B. the linear strenght of the relationship between the dependent and the independent variables. (RÄTT SVAR).
C. s specific value of the dependent variable for a given of the independent variable
D. the relationship between qualitative variables
E. None of these alternatives is correct

Question 5

In regression analysis, if the indepedent variable is measured in kgs, the dependent variable

Answer 5

A. must also be in kgs
B. Must be in some unit of weight
C. can not be in kgs
D. can be any units (RÄTT SVAR)
E. none of these alternatives is correct.

Question 6

True of false questions (25 points)
A correct answer to the each question gives 5 points, incorrect answer gives 0 points.

Question 7

The x2 goodness of fit test is used to compare the sample distribution of a categorical variable ( True or false) Answer is TRUE

Question 8

The test statistic x2-used in goodness of fit test has k degress of freedom, where k is the number of categories. (FALSE)

Question 9

The F statistic is used in to test whether the overall multiple regression model is valid. (TRUE)

Question 10

The strenght of the correlation between two sets of data depends on the sign of the coefficient of correlation. (FALSE)

Question 11

The least squares method minimizes the sum of squares of the vertical distances between the actual y values and the predicted values of y. (TRUE)