In ANCOVA, suppose Y is the dependent variable, X is the
covariate, and the factor has two levels. Also all assumptions of
ANCOVA are met. Which of the following situations is the most
desirable?
a. rXY = 0.5; x̅₁=10, x̅₂=12, x̅ =11.
b. rXY = 0.1; x̅₁=10, x̅₂=12, x̅ =11.
c. rXY = -0.1; x̅₁=10, x̅₂=20, x̅ =15.
d. rXY = -0.5; x̅₁=10, x̅₂.=20, x̅ =15.
option A is correct;as sample mean are close as well there is a higher correlation between X and Y,
In ANCOVA, suppose Y is the dependent variable, X is the covariate, and the factor has...
If the regression slopes of the dependent variable (Y) on the covariate (X) are substantially different across the groups, one would expect that a. the adjusted means will be biased. b. Y is independent of X. c. the factor is not independent of X. d. there is a modest effect with equal n's in quasi-experiment.
If the regression slopes of the dependent variable (Y) on the covariate (X) are substantially different across the groups, one would expect that a. the adjusted means will be biased. b. Y is independent of X. c. the factor is not independent of X. d. there is a modest effect with equal n's in quasi-experiment.
The following information
regarding a dependent variable (Y in $1000) and an independent
variable (X) is provided.
Y
Dependent Variable
15
17
23
17
I. The least-squares estimate of the slope
equals:
II. The least-squares estimate of the intercept
equals:
III. If the independent variable increases by 2
units, the dependent variable is expected to
a. decrease by $300
b. decrease by $3000
c. decrease by $3
d. decrease by $2
e. none of the above
The letter corresponding...
The following information regarding a dependent variable (Y in
$1000) and an independent variable (X) is provided.
Y
Dependent Variable
15
17
23
17
I. The least-squares estimate of the slope
equals:
II. The least-squares estimate of the intercept
equals:
III. If the independent variable increases by 2
units, the dependent variable is expected to
a. decrease by $300
b. decrease by $3000
c. decrease by $3
d. decrease by $2
e. none of the above
The letter corresponding...
Exhibit 12-2 You are given the following information about y and x. y x Dependent Independent Variable Variable 5 15 7 12 9 10 11 7 Refer to Exhibit 12-2. The least squares estimate of b 0 equals -0.1125 13.75 16.412 -7.647
Exhibit 12-22 You are given the following information about y and x Dependent Independent Variable Variable 10 15 4 12 10 Refer to Exhibit 12-22. The sample correlation coefficient equals -86.667 -0.2866 0.99705 0.2866
The data shown to the right for the dependent variable, and the independent variable, xhave been collected using simple random sampling a Construct a scatter plot for these data Based on the scatter plot, how would you describe the relationship between the two variables? b Compute the correlation coefficient X 10 110 14 130 12 120 13 140 15 100 11 100 14 150 11 130 a Which graph below shows a cutter plot for these data? ОА ос. 180...
Using the following data with x as the independent variable and
y as the dependent variable, answer the items.
x
-14
-22
18
8
24
y
64
253
159
9
347
у 360 Tools 324 . 288 point 1 point 2 252 216 point 3 point 4 180 144 108 point 5 72 36 0 -25 -20 -15 -10 -50 5 10 15 20 25 x b. Compute the correlation coefficient. (Round your answer to 4 decimal places.) Correlation coefficient...
The equation of the regression line between two variables x (independent variable) and y (dependent variable) is given by y-hat = -3x + 2; and the correlation coefficient is r = -.95. The possible x-values range from 1 to 10. Which of the following statements are correct? I. The variable y is strongly positive correlated to the variable x. II. The variable y is strongly negative correlated to the variable x. III. If x = 5, one would predict that...
The data shown below for the dependent variable, y, and the
independent variable, x, have been collected using simple random
sampling.
x y
11 100
13 80
15 80
12 90
20 60
17 60
15 70
13 90
15 90
17 80
a. Complete the linear regression equation below Round to one decimal place as needed.) b. Calculate the sum of the squared residuals. SSE-L (Round to the nearest whole number as needed) What is the total sum of...