Question 1

The values of a and b in the regression equation are called the regression coefficients.

Accepted Answer

A) True 
 B)False

Question 2

One assumption underlying linear regression is that the Y values are statistically dependent. This means that in selecting a sample, the Y values chosen, for a particular X value, depend on the Y values for any other X value.

Accepted Answer

A) True 
 B)False

Question 3

What is the purpose of measuring correlation?

Accepted Answer

To provide a measure

Question 4

A hypothesis test is conducted at the .05 level of significance to test whether or not the population correlation is zero. If the sample consists of 25 observations and the correlation coefficient is 0.60, what is the computed value of the test statistic?

Accepted Answer

A)  1.96 
B)  2.07 
C)  2.94 
D)  3.60 
A)  1.96 
B)  2.07 
C)  2.94 
D)  3.60

Question 5

The regression equation is Ŷ = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the test statistic to test the significance of the slope?

Accepted Answer

A)  z = -2.56 
B)  z = 2.639 
C)  t = 2.56 
D)  t = 2.639 
A)  z = -2.56 
B)  z = 2.639 
C)  t = 2.56 
D)  t = 2.639

Question 6

In the regression equation, what does the letter "b" represent?

Accepted Answer

A)  Y intercept 
B)  Slope of the line 
C)  Any value of the independent variable that is selected 
D)  Value of Y when X = 0 
A)  Y intercept 
B)  Slope of the line 
C)  Any value of the independent variable that is selected 
D)  Value of Y when X = 0

Question 7

A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a sales person makes and the amount of the sales dollars earned. A regression analysis shows the following results:   What is the Y-intercept of the linear equation?

Accepted Answer

A)  -12.201 
B)  2.195 
C)  -1.860 
D)  12.505 
A)  -12.201 
B)  2.195 
C)  -1.860 
D)  12.505

Question 8

Using the following information:    
 If testing the hypothesis: H0: $\rho$ = 0, the computed t - statistic is:

Accepted Answer

A)  9.45 
B)  8.84 
C)  8.18 
D)  Cannot be computed 
A)  9.45 
B)  8.84 
C)  8.18 
D)  Cannot be computed

Question 9

The regression equation is ? = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the critical value to test the significance of the slope at the 0.05 significance level?

Accepted Answer

A)  z = $\pm$1.96 
B)  t = $\pm$ 2.179 
C)  t = $\pm$2.145 
D)  t = +2.145 
A)  z = $\pm$1.96 
B)  t = $\pm$ 2.179 
C)  t = $\pm$2.145 
D)  t = +2.145

Question 10

A company wants to study the effect of an employee's length of employment on their number of workdays absent. The company collected the following information on a random sample of seven employees.   What is the dependent variable (Y)? _____________________

Accepted Answer

Number of

The values of a and b in the regression equation are called the regression coefficients.

One assumption underlying linear regression is that the Y values are statistically dependent. This means that in selecting a sample, the Y values chosen, for a particular X value, depend on the Y values for any other X value.

What is the purpose of measuring correlation?

A hypothesis test is conducted at the .05 level of significance to test whether or not the population correlation is zero. If the sample consists of 25 observations and the correlation coefficient is 0.60, what is the computed value of the test statistic?

The regression equation is Ŷ = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the test statistic to test the significance of the slope?

In the regression equation, what does the letter "b" represent?

A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a sales person makes and the amount of the sales dollars earned. A regression analysis shows the following results: What is the Y-intercept of the linear equation?

The regression equation is ? = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the critical value to test the significance of the slope at the 0.05 significance level?

A company wants to study the effect of an employee's length of employment on their number of workdays absent. The company collected the following information on a random sample of seven employees. What is the dependent variable (Y)? _____________________

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Numerical Measures

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

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Exam 13: Correlation and Linear Regression

The values of a and b in the regression equation are called the regression coefficients.

One assumption underlying linear regression is that the Y values are statistically dependent. This means that in selecting a sample, the Y values chosen, for a particular X value, depend on the Y values for any other X value.

What is the purpose of measuring correlation?

A hypothesis test is conducted at the .05 level of significance to test whether or not the population correlation is zero. If the sample consists of 25 observations and the correlation coefficient is 0.60, what is the computed value of the test statistic?

The regression equation is Ŷ = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the test statistic to test the significance of the slope?

In the regression equation, what does the letter "b" represent?

A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a sales person makes and the amount of the sales dollars earned. A regression analysis shows the following results: What is the Y-intercept of the linear equation?

Using the following information: If testing the hypothesis: H0: ρ\rhoρ = 0, the computed t - statistic is:

The regression equation is ? = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the critical value to test the significance of the slope at the 0.05 significance level?

A company wants to study the effect of an employee's length of employment on their number of workdays absent. The company collected the following information on a random sample of seven employees. What is the dependent variable (Y)? _____________________

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Numerical Measures

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters