Question 1

The problem of multicollinearity arises when the:

Accepted Answer

A)  dependent variables are highly correlated with one another. 
B)  independent variables are highly correlated with one another. 
C)  independent variables are highly correlated with the dependent variable. 
D)  None of these choices. 
A)  dependent variables are highly correlated with one another. 
B)  independent variables are highly correlated with one another. 
C)  independent variables are highly correlated with the dependent variable. 
D)  None of these choices.

Question 2

A chi-squared distribution has a shape that is ____________________.

Accepted Answer

positively

Question 3

One method of diagnosing heteroscedasticity is to plot the residuals against the predicted values of y, then look for a change in the spread of the plotted values.

Accepted Answer

A) True 
 B)False

Question 4

A councilwoman regularly polls her constituency to gauge her level of support among voters. This month, 652 out of 1158 voters support her. Five months ago, 412 out of 982 voters supported her. With a 5% significance level, can she infer that support has increased by at least 10 percentage points?

Accepted Answer

@#IMG-DLM& vs. @#IMG-DLM& Rejection region: z > z_.05 = 1.645 Te

Question 5

The method statisticians use to produce a straight line that minimizes the SSE is called the ____________________ method.

Accepted Answer

The answer of The method statisticians use to produce a...

Question 6

The service manager of a car dealer wants to determine if owners of new cars (two years old or less) tune up their cars more frequently than owners of older cars (more than two years old). From his records he takes a random sample of ten new cars and ten older cars and determines the number of times the cars were tuned up in the last 12 months. The data follow. Do these data allow the service station owner to infer at the 10% significance level that new car owners tune up their cars more frequently than older car owners?

Accepted Answer

@#IMG-DLM& , @#IMG-DLM& Rejection region: t > t_0.10,18 = 1.33 Test

Question 7

The F-distribution is the sampling distribution of the ratio of:

Accepted Answer

A)  two sample variances. 
B)  two normal population means. 
C)  two normal population variances. 
D)  None of these choices. 
A)  two sample variances. 
B)  two normal population means. 
C)  two normal population variances. 
D)  None of these choices.

Question 8

For a multiple regression model, the total variation in y can be expressed as:

Accepted Answer

A)  SSE - SSR. 
B)  SSR - SSE. 
C)  SSR + SSE. 
D)  SSR / SSE. 
A)  SSE - SSR. 
B)  SSR - SSE. 
C)  SSR + SSE. 
D)  SSR / SSE.

Question 9

The test statistic employed to test   is   is F-distributed with v1 = n1 -  1 and v2 = n2 - 1 degrees of freedom if the two populations are F-distributed.

Accepted Answer

A) True 
 B)False

Question 10

The t-distribution is used in a confidence interval for a mean when the actual standard error is not known.

Accepted Answer

A) True 
 B)False

Question 11

When the error variable does not have constant variance, this condition is called ____________________.

Accepted Answer

The answer of When the error variable does not have...

Question 12

A scatter diagram includes the following data points:
   Two regression models are proposed: (1)   , and (2)   . Using the least squares method, which of these regression models provides the better fit to the data? Why?

Accepted Answer

SSE = 4.95 and 126.25 for mode

Question 13

If the coefficient of correlation is 1.0, then the coefficient of determination must be 1.0.

Accepted Answer

A) True 
 B)False

Question 14

SST measures the variation ____________________ treatments.

Accepted Answer

The answer of SST measures the variation ____________________ treatments....

Question 15

Which of the following is not an example illustrating the use of variance?

Accepted Answer

A)  As a measure of risk. 
B)  As a judge of consistency. 
C)  To search for and reduce variability in a process. 
D)  All of these choices are true. 
A)  As a measure of risk. 
B)  As a judge of consistency. 
C)  To search for and reduce variability in a process. 
D)  All of these choices are true.

Question 16

The pooled-variances t-test requires that the two population variances need not be the same.

Accepted Answer

A) True 
 B)False

Question 17

The Bonferroni adjustment to Fisher's Least Significant Difference (LSD) multiple comparison method is made by dividing the specified experimentwise Type I error rate by the number of pairs of population means.

Accepted Answer

A) True 
 B)False

Question 18

SSE measures the variation ____________________ treatments.

Accepted Answer

The answer of SSE measures the variation ____________________ treatments....

Question 19

In the simple linear regression model, the y-intercept represents the:

Accepted Answer

A)  change in y per unit change in x. 
B)  change in x per unit change in y. 
C)  value of y when x = 0. 
D)  value of x when y = 0. 
A)  change in y per unit change in x. 
B)  change in x per unit change in y. 
C)  value of y when x = 0. 
D)  value of x when y = 0.

Question 20

The ANOVA procedure tests to determine whether differences exist between two or more population ____________________.

Accepted Answer

The answer of The ANOVA procedure tests to determine whether...

The problem of multicollinearity arises when the:

A chi-squared distribution has a shape that is ____________________.

One method of diagnosing heteroscedasticity is to plot the residuals against the predicted values of y, then look for a change in the spread of the plotted values.

A councilwoman regularly polls her constituency to gauge her level of support among voters. This month, 652 out of 1158 voters support her. Five months ago, 412 out of 982 voters supported her. With a 5% significance level, can she infer that support has increased by at least 10 percentage points?

The method statisticians use to produce a straight line that minimizes the SSE is called the ____________________ method.

The F-distribution is the sampling distribution of the ratio of:

For a multiple regression model, the total variation in y can be expressed as:

The test statistic employed to test is is F-distributed with v₁ = n₁ - 1 and v₂ = n₂ - 1 degrees of freedom if the two populations are F-distributed.

The t-distribution is used in a confidence interval for a mean when the actual standard error is not known.

When the error variable does not have constant variance, this condition is called ____________________.

A scatter diagram includes the following data points: Two regression models are proposed: (1) , and (2) . Using the least squares method, which of these regression models provides the better fit to the data? Why?

If the coefficient of correlation is 1.0, then the coefficient of determination must be 1.0.

SST measures the variation ____________________ treatments.

Which of the following is not an example illustrating the use of variance?

The pooled-variances t-test requires that the two population variances need not be the same.

The Bonferroni adjustment to Fisher's Least Significant Difference (LSD) multiple comparison method is made by dividing the specified experimentwise Type I error rate by the number of pairs of population means.

SSE measures the variation ____________________ treatments.

In the simple linear regression model, the y-intercept represents the:

The ANOVA procedure tests to determine whether differences exist between two or more population ____________________.

What Is Statistics

Graphical and Tabular Descriptive Techniques

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations, Part 1

Inference About Comparing Two Populations, Part 2

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 18: Review of Statistical Inference

The problem of multicollinearity arises when the:

A chi-squared distribution has a shape that is ____________________.

One method of diagnosing heteroscedasticity is to plot the residuals against the predicted values of y, then look for a change in the spread of the plotted values.

A councilwoman regularly polls her constituency to gauge her level of support among voters. This month, 652 out of 1158 voters support her. Five months ago, 412 out of 982 voters supported her. With a 5% significance level, can she infer that support has increased by at least 10 percentage points?

The method statisticians use to produce a straight line that minimizes the SSE is called the ____________________ method.

The F-distribution is the sampling distribution of the ratio of:

For a multiple regression model, the total variation in y can be expressed as:

The test statistic employed to test is is F-distributed with v1 = n1 - 1 and v2 = n2 - 1 degrees of freedom if the two populations are F-distributed.

The t-distribution is used in a confidence interval for a mean when the actual standard error is not known.

When the error variable does not have constant variance, this condition is called ____________________.

A scatter diagram includes the following data points: Two regression models are proposed: (1) , and (2) . Using the least squares method, which of these regression models provides the better fit to the data? Why?

If the coefficient of correlation is 1.0, then the coefficient of determination must be 1.0.

SST measures the variation ____________________ treatments.

Which of the following is not an example illustrating the use of variance?

The pooled-variances t-test requires that the two population variances need not be the same.

The Bonferroni adjustment to Fisher's Least Significant Difference (LSD) multiple comparison method is made by dividing the specified experimentwise Type I error rate by the number of pairs of population means.

SSE measures the variation ____________________ treatments.

In the simple linear regression model, the y-intercept represents the:

The ANOVA procedure tests to determine whether differences exist between two or more population ____________________.

What Is Statistics

Graphical and Tabular Descriptive Techniques

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations, Part 1

Inference About Comparing Two Populations, Part 2

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

The test statistic employed to test is is F-distributed with v₁ = n₁ - 1 and v₂ = n₂ - 1 degrees of freedom if the two populations are F-distributed.