Question 1

In the linear regression equation, Y=a+bx, "a" represents 	-----------.

Accepted Answer

A)  the predicted value of y 
B)  the y-intercept 
C)  slope 
D)  Pearson's r 
A)  the predicted value of y 
B)  the y-intercept 
C)  slope 
D)  Pearson's r

Question 2

A relationship is said to be strong when Pearson's r is .10.

Accepted Answer

A) True 
 B)False

Question 3

Based on the equation in question 4, where does the regression line cross the y-axis?

Accepted Answer

A)  -7.8 
B)  -4.4 
C)  4 
D)  12.4 
A)  -7.8 
B)  -4.4 
C)  4 
D)  12.4

Question 4

In the linear regression equation, "b" represents the y-intercept.

Accepted Answer

A) True 
 B)False

Question 5

Use the table below to answer the following questions:
   a.Calculate the slope and the y-intercept for the regression line for the distribution. Writethe regression line.
Slope:
Y-intercept:
Regression line:
b.Interpret the numbers of both the slope and the y-intercept.
c.Compute r and r2 for the regression equation.
d. Interpret both the r and r2 . What does each number tell us?

Accepted Answer

a.Slope: 1.45
Y-intercept: 49.3
Regressi

Question 6

Use the data below to answer the following questions:
a. Create a scatterplot using the data below.
   b. Calculate the slope and the y-intercept for the regression line for the distribution. Write the regression line equation.
Slope:
Y-intercept:
Regression line:
   c.Interpret the numbers of boththe slope and the y-intercept.
d.Compute r and 2 for the regression equation.
e. Interpret both the r and 2 What does each number tell us?

Accepted Answer

a. @#IMG-DLM& b.Slope: -3.14
Y-intercept: 66.52
Re

Question 7

Based on the equation in question 1, where does the regression line cross the y-axis?

Accepted Answer

A)  3 
B)  12 
C)  21 
D)  33 
A)  3 
B)  12 
C)  21 
D)  33

Question 8

Use the data below to answer questions:
  
-How many degrees of freedom exist in the data?

Accepted Answer

A)  0 
B)  2 
C)  3 
D)  5 
A)  0 
B)  2 
C)  3 
D)  5

In the linear regression equation, Y=a+bx, "a" represents -----------.

A relationship is said to be strong when Pearson's r is .10.

Based on the equation in question 4, where does the regression line cross the y-axis?

In the linear regression equation, "b" represents the y-intercept.

Based on the equation in question 1, where does the regression line cross the y-axis?

Use the data below to answer questions: -How many degrees of freedom exist in the data?

Concepts, Variables, and Measurement

Frequency Tables

Measures of Central Tendency

Measures of Dispersion

Probability and the Normal Curve

Probabilityfrom Samples to Statistics

Cross-Tabulation Tables and Chi-Square

Measures of Association for Categorical Variables

Analysis of Variance

Filters

Exam 10: Correlation and Regression

In the linear regression equation, Y=a+bx, "a" represents -----------.

A relationship is said to be strong when Pearson's r is .10.

Based on the equation in question 4, where does the regression line cross the y-axis?

In the linear regression equation, "b" represents the y-intercept.

Based on the equation in question 1, where does the regression line cross the y-axis?

Use the data below to answer questions: -How many degrees of freedom exist in the data?

Concepts, Variables, and Measurement

Frequency Tables

Measures of Central Tendency

Measures of Dispersion

Probability and the Normal Curve

Probabilityfrom Samples to Statistics

Cross-Tabulation Tables and Chi-Square

Measures of Association for Categorical Variables

Analysis of Variance

Filters