Question 1

The time-series component that exhibits fluctuations over more than a year in time above and below the secular trend is ________.

Accepted Answer

A) Irregular 
B) Cyclical 
C) Seasonal 
D) A trend 
A) Irregular 
B) Cyclical 
C) Seasonal 
D) A trend

Question 2

The trend forecast equation is   = 50 + 420t. The next forecast is for period 10. The typical seasonal index for period 10 is 0.82. What are the forecast sales for period 10?

Accepted Answer

A) 4,200 
B) 4,250 
C) 4,000 
D) 3,485 
A) 4,200 
B) 4,250 
C) 4,000 
D) 3,485

Question 3

Which one of the following is not a component of a time series?

Accepted Answer

A) Secular trend 
B) Moving average 
C) Seasonal variation 
D) Irregular variation 
A) Secular trend 
B) Moving average 
C) Seasonal variation 
D) Irregular variation

Question 4

A typical seasonal index of 103.7 for January indicates that sales for January are below the annual average.

Accepted Answer

A) True 
 B)False

Question 5

The Durbin-Watson statistic is used to test for correlated residuals.

Accepted Answer

A) True 
 B)False

Question 6

For quarterly seasonal indexes,the total of the adjusted quarterly indexes will equal ________.

Accepted Answer

A) 4.0 
B) 1.0 
C) 100% 
D) a variable 
A) 4.0 
B) 1.0 
C) 100% 
D) a variable

Question 7

If the exports (in million $)for the period 2006 through 2010 were $878,$892,$864,$870,and $912,respectively,what are these values called?

Accepted Answer

A) Moving average 
B) Linear trend equation 
C) Logarithmic trend equation 
D) Time-series data 
A) Moving average 
B) Linear trend equation 
C) Logarithmic trend equation 
D) Time-series data

Question 8

Which of the following statements about autocorrelation are true? 
I. Successive residuals are often correlated in time series because an event in one time period often influences the event in the next period.
II. If residuals are correlated,we can use r as the coefficient of correlation and conduct the common tests of hypothesis about regression coefficients.
III. A Durbin-Watson statistic d is used,instead of directly conducting a hypothesis test on r.

Accepted Answer

A) I only 
B) II only 
C) II and III 
D) I and III 
A) I only 
B) II only 
C) II and III 
D) I and III

Question 9

What is the logarithmic transformation for the equation   = a + bt?

Accepted Answer

A) log a = S log   /n 
B) log   = log a + log b(t) 
C) log b = S(X log)   /t2 
D)    = abt 
A) log a = S log   /n 
B) log   = log a + log b(t) 
C) log b = S(X log)   /t2 
D)    = abt

Question 10

The trend forecast equation is   = 120 + 100t. The next forecast is for period 11. The typical seasonal index for period 11 is 0.82. What are the forecast sales for period 11?

Accepted Answer

A) 1,100 
B) 1,220 
C) 1,000 
D) 640 
A) 1,100 
B) 1,220 
C) 1,000 
D) 640

Question 11

For the third quarter,the sales are 1,500 units; the seasonal index for the quarter is 1.15. What are the deseasonalized sales for the quarter?

Accepted Answer

A) 115% 
B) 15% 
C) 1,304 
D) 1,500 
A) 115% 
B) 15% 
C) 1,304 
D) 1,500

Question 12

If the time series trend is nonlinear,a transformation of the data is required.

Accepted Answer

A) True 
 B)False

Question 13

The forecast for the third quarter is 1,000 units; the seasonal index for the quarter is 1.10. What are the seasonally adjusted sales for the quarter?

Accepted Answer

A) 1,100 
B) 1,110 
C) 110 
D) 100 
A) 1,100 
B) 1,110 
C) 110 
D) 100

Question 14

For an annual time series extending from 2000 through 2010,how many years would be lost in a three-year moving average?

Accepted Answer

A) Two at the start and one at the end 
B) One at the start and one at the end 
C) Two at the start and zero at the end 
D) Zero at the start and two at the end 
A) Two at the start and one at the end 
B) One at the start and one at the end 
C) Two at the start and zero at the end 
D) Zero at the start and two at the end

Question 15

What is the long-term behavior of a variable over an extended period of time called?

Accepted Answer

A) Secular trend 
B) Seasonal variation 
C) Cyclical variation 
D) Irregular or erratic variation 
A) Secular trend 
B) Seasonal variation 
C) Cyclical variation 
D) Irregular or erratic variation

Question 16

In a time series,economic periods of prosperity followed by recession are described as a(n)________.

Accepted Answer

A) secular trend 
B) seasonal variation 
C) cyclical variation 
D) erratic variation 
A) secular trend 
B) seasonal variation 
C) cyclical variation 
D) erratic variation

Question 17

For the third quarter,the sales are 1,000 units; the seasonal index for the quarter is 1.10. What are the deseasonalized sales for the quarter?

Accepted Answer

A) 1,000 
B) 1,100 
C) 909 
D) 0.90 
A) 1,000 
B) 1,100 
C) 909 
D) 0.90

Question 18

To calculate monthly typical seasonal indexes,the specific seasonal indexes must be averaged for ________.

Accepted Answer

A) every month 
B) every year 
C) every quarter 
D) every day 
A) every month 
B) every year 
C) every quarter 
D) every day

Question 19

The following trend equation is for a manufacturer of women's purses (in millions of purses)based on six years of quarterly data.   = 2.15 + 1.32t The following table provides the seasonal factors for each quarter.   The seasonally adjusted forecast for the second quarter of the fifth year is ________.

Accepted Answer

A) 25.91 
B) 15.35 
C) 29.15 
D) 6.8 
A) 25.91 
B) 15.35 
C) 29.15 
D) 6.8

Question 20

In the linear trend equation,Y = a + bt,the coefficient b represents ________.

Accepted Answer

A) any value of time that is selected 
B) the Y-intercept of the trend line 
C) the slope of the trend line 
D) the projected value at some point in time 
A) any value of time that is selected 
B) the Y-intercept of the trend line 
C) the slope of the trend line 
D) the projected value at some point in time

The time-series component that exhibits fluctuations over more than a year in time above and below the secular trend is ________.

The trend forecast equation is = 50 + 420t. The next forecast is for period 10. The typical seasonal index for period 10 is 0.82. What are the forecast sales for period 10?

Which one of the following is not a component of a time series?

A typical seasonal index of 103.7 for January indicates that sales for January are below the annual average.

The Durbin-Watson statistic is used to test for correlated residuals.

For quarterly seasonal indexes,the total of the adjusted quarterly indexes will equal ________.

If the exports (in million $)for the period 2006 through 2010 were $878,$892,$864,$870,and $912,respectively,what are these values called?

What is the logarithmic transformation for the equation = a + bt?

The trend forecast equation is = 120 + 100t. The next forecast is for period 11. The typical seasonal index for period 11 is 0.82. What are the forecast sales for period 11?

For the third quarter,the sales are 1,500 units; the seasonal index for the quarter is 1.15. What are the deseasonalized sales for the quarter?

If the time series trend is nonlinear,a transformation of the data is required.

The forecast for the third quarter is 1,000 units; the seasonal index for the quarter is 1.10. What are the seasonally adjusted sales for the quarter?

For an annual time series extending from 2000 through 2010,how many years would be lost in a three-year moving average?

What is the long-term behavior of a variable over an extended period of time called?

In a time series,economic periods of prosperity followed by recession are described as a(n)________.

For the third quarter,the sales are 1,000 units; the seasonal index for the quarter is 1.10. What are the deseasonalized sales for the quarter?

To calculate monthly typical seasonal indexes,the specific seasonal indexes must be averaged for ________.

The following trend equation is for a manufacturer of women's purses (in millions of purses)based on six years of quarterly data. = 2.15 + 1.32t The following table provides the seasonal factors for each quarter. The seasonally adjusted forecast for the second quarter of the fifth year is ________.

In the linear trend equation,Y = a + bt,the coefficient b represents ________.

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

Correlation and Linear Regression

Multiple Regression Analysis

Nonparametric Methods: Nominal Level Hypothesis Tests

Nonparametric Methods: Analysis of Ordinal Data

Index Numbers

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters

Exam 18: Time Series and Forecasting

The time-series component that exhibits fluctuations over more than a year in time above and below the secular trend is ________.

The trend forecast equation is = 50 + 420t. The next forecast is for period 10. The typical seasonal index for period 10 is 0.82. What are the forecast sales for period 10?

Which one of the following is not a component of a time series?

A typical seasonal index of 103.7 for January indicates that sales for January are below the annual average.

The Durbin-Watson statistic is used to test for correlated residuals.

For quarterly seasonal indexes,the total of the adjusted quarterly indexes will equal ________.

If the exports (in million $)for the period 2006 through 2010 were $878,$892,$864,$870,and $912,respectively,what are these values called?

What is the logarithmic transformation for the equation = a + bt?

The trend forecast equation is = 120 + 100t. The next forecast is for period 11. The typical seasonal index for period 11 is 0.82. What are the forecast sales for period 11?

For the third quarter,the sales are 1,500 units; the seasonal index for the quarter is 1.15. What are the deseasonalized sales for the quarter?

If the time series trend is nonlinear,a transformation of the data is required.

The forecast for the third quarter is 1,000 units; the seasonal index for the quarter is 1.10. What are the seasonally adjusted sales for the quarter?

For an annual time series extending from 2000 through 2010,how many years would be lost in a three-year moving average?

What is the long-term behavior of a variable over an extended period of time called?

In a time series,economic periods of prosperity followed by recession are described as a(n)________.

For the third quarter,the sales are 1,000 units; the seasonal index for the quarter is 1.10. What are the deseasonalized sales for the quarter?

To calculate monthly typical seasonal indexes,the specific seasonal indexes must be averaged for ________.

The following trend equation is for a manufacturer of women's purses (in millions of purses)based on six years of quarterly data. = 2.15 + 1.32t The following table provides the seasonal factors for each quarter. The seasonally adjusted forecast for the second quarter of the fifth year is ________.

In the linear trend equation,Y = a + bt,the coefficient b represents ________.

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

Correlation and Linear Regression

Multiple Regression Analysis

Nonparametric Methods: Nominal Level Hypothesis Tests

Nonparametric Methods: Analysis of Ordinal Data

Index Numbers

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters