Exam 12: Simple Regression Analysis and Correlation

The equation of the trend line for the data based on sales (in $1000)of a local restaurant over the years 2005-2010 is Sales= -265575+132.571 year.Using the trend line,the forecast sales for the year 2012 is ________

(Multiple Choice)

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Question 61

For the regression line,y = 21 − 5x,21 is the y-intercept of the line.

(True/False)

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Question 62

Abby Kratz,a market specialist at the market research firm of Saez,Sikes,and Spitz,is analyzing household budget data collected by her firm.Abby's dependent variable is monthly household expenditures on groceries (in $'s),and her independent variable is annual household income (in $1,000's).Regression analysis of the data yielded the following tables. 11ea8a11_bc89_6776_9fff_6fbac6884e88_TB6468_00 Abby's regression model is .s),and her independent variable is annual household income (in $1,000's).Regression analysis of the data yielded the following tables. Abby's regression model is ." class="answers-bank-image d-inline" loading="lazy" > Abby's regression model is .s),and her independent variable is annual household income (in $1,000's).Regression analysis of the data yielded the following tables. Abby's regression model is ." class="answers-bank-image d-inline" loading="lazy" > 11ea8a11_bc89_6776_9fff_6fbac6884e88_TB6468_00 Abby's regression model is __________.

(Multiple Choice)

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Question 63

The first step in simple regression analysis usually is to construct a scatter plot.

(True/False)

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Question 64

-For a certain data set the regression equation is y = 29 - 5x.The correlation coefficient between y and x in this data set _______.

(Multiple Choice)

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Question 65

The numerical value of the coefficient of determination must be _______.

(Multiple Choice)

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Question 66

Given x,a 95% prediction interval for a single value of y is always wider than a 95% confidence interval for the average value of y.

(True/False)

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Question 67

A manager wants to predict the cost (y)of travel for salespeople based on the number of days (x)spent on each sales trip.The following model has been developed: y = $400 + 120x.If a trip took 3 days,the predicted cost of the trip is _____________.

(Multiple Choice)

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Question 68

In the regression equation,y = 2.164 + 1.3657x,n = 6,the mean of x is 8.667,S_xx= 89.333 and S_e= 3.44.A 95% confidence interval for the average of y when x=8 is _________

(Multiple Choice)

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Question 69

-For a certain data set the regression equation is y = 37 + 13x.The correlation coefficient between y and x in this data set _______.

(Multiple Choice)

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Question 70

-In the regression equation,y = 49.56 + 0.97x,the slope is _______.

(Multiple Choice)

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Question 71

One of the assumptions of simple regression analysis is that the error terms are exponentially distributed

(True/False)

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Question 72

Regression output from Excel software includes an ANOVA table.

(True/False)

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Question 73

A t-test is used to determine whether the coefficients of the regression model are significantly different from zero.

(True/False)

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Question 74

The following data is to be used to construct a regression model: The value of the intercept is ________.

(Multiple Choice)

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Question 75

The slope of the regression line,y = 21 − 5x,is 5.

(True/False)

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Question 76

In simple regression analysis the error terms are assumed to be independent and normally distributed with zero mean and constant variance.

(True/False)

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Question 77

A manager wants to predict the cost (y)of travel for salespeople based on the number of days (x)spent on each sales trip.The following model has been developed: y = $400 + 120x.If a trip took 4 days,the predicted cost of the trip is _____________.

(Multiple Choice)

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Question 78

Regression methods can be pursued to estimate trends that are linear in time.

(True/False)

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Question 79

Regression output from Excel software directly shows the regression equation.

(True/False)

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Question 80

Showing 61 - 80 of 106

The equation of the trend line for the data based on sales (in $1000)of a local restaurant over the years 2005-2010 is Sales= -265575+132.571 year.Using the trend line,the forecast sales for the year 2012 is ________

For the regression line,y = 21 − 5x,21 is the y-intercept of the line.

The first step in simple regression analysis usually is to construct a scatter plot.

-For a certain data set the regression equation is y = 29 - 5x.The correlation coefficient between y and x in this data set _______.

The numerical value of the coefficient of determination must be _______.

Given x,a 95% prediction interval for a single value of y is always wider than a 95% confidence interval for the average value of y.

A manager wants to predict the cost (y)of travel for salespeople based on the number of days (x)spent on each sales trip.The following model has been developed: y = $400 + 120x.If a trip took 3 days,the predicted cost of the trip is _____________.

In the regression equation,y = 2.164 + 1.3657x,n = 6,the mean of x is 8.667,S_xx= 89.333 and S_e= 3.44.A 95% confidence interval for the average of y when x=8 is _________

-For a certain data set the regression equation is y = 37 + 13x.The correlation coefficient between y and x in this data set _______.

-In the regression equation,y = 49.56 + 0.97x,the slope is _______.

One of the assumptions of simple regression analysis is that the error terms are exponentially distributed

Regression output from Excel software includes an ANOVA table.

A t-test is used to determine whether the coefficients of the regression model are significantly different from zero.

The following data is to be used to construct a regression model: The value of the intercept is ________.

The slope of the regression line,y = 21 − 5x,is 5.

In simple regression analysis the error terms are assumed to be independent and normally distributed with zero mean and constant variance.

A manager wants to predict the cost (y)of travel for salespeople based on the number of days (x)spent on each sales trip.The following model has been developed: y = $400 + 120x.If a trip took 4 days,the predicted cost of the trip is _____________.

Regression methods can be pursued to estimate trends that are linear in time.

Regression output from Excel software directly shows the regression equation.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

A Nalysis of Variance and Design of Experiments

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

Exam 12: Simple Regression Analysis and Correlation

The equation of the trend line for the data based on sales (in $1000)of a local restaurant over the years 2005-2010 is Sales= -265575+132.571 year.Using the trend line,the forecast sales for the year 2012 is ________

For the regression line,y = 21 − 5x,21 is the y-intercept of the line.

The first step in simple regression analysis usually is to construct a scatter plot.

-For a certain data set the regression equation is y = 29 - 5x.The correlation coefficient between y and x in this data set _______.

The numerical value of the coefficient of determination must be _______.

Given x,a 95% prediction interval for a single value of y is always wider than a 95% confidence interval for the average value of y.

A manager wants to predict the cost (y)of travel for salespeople based on the number of days (x)spent on each sales trip.The following model has been developed: y = $400 + 120x.If a trip took 3 days,the predicted cost of the trip is _____________.

In the regression equation,y = 2.164 + 1.3657x,n = 6,the mean of x is 8.667,Sxx= 89.333 and Se= 3.44.A 95% confidence interval for the average of y when x=8 is _________

-For a certain data set the regression equation is y = 37 + 13x.The correlation coefficient between y and x in this data set _______.

-In the regression equation,y = 49.56 + 0.97x,the slope is _______.

One of the assumptions of simple regression analysis is that the error terms are exponentially distributed

Regression output from Excel software includes an ANOVA table.

A t-test is used to determine whether the coefficients of the regression model are significantly different from zero.

The following data is to be used to construct a regression model: The value of the intercept is ________.

The slope of the regression line,y = 21 − 5x,is 5.

In simple regression analysis the error terms are assumed to be independent and normally distributed with zero mean and constant variance.

A manager wants to predict the cost (y)of travel for salespeople based on the number of days (x)spent on each sales trip.The following model has been developed: y = $400 + 120x.If a trip took 4 days,the predicted cost of the trip is _____________.

Regression methods can be pursued to estimate trends that are linear in time.

Regression output from Excel software directly shows the regression equation.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

A Nalysis of Variance and Design of Experiments

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

In the regression equation,y = 2.164 + 1.3657x,n = 6,the mean of x is 8.667,S_xx= 89.333 and S_e= 3.44.A 95% confidence interval for the average of y when x=8 is _________