Question 1

The time series component that reflects variability over short repetitive time periods and has duration of less than one year is called:

Accepted Answer

A)  trend. 
B)  cyclical. 
C)  seasonal. 
D)  random variation. 
A)  trend. 
B)  cyclical. 
C)  seasonal. 
D)  random variation.

Question 2

Time periods
The following are the values of a time series for the first four time periods: $$\begin{array} { | c | c c c c | } 
\hline \boldsymbol { t } & 1 & 2 & 3 & 4 \
\hline y _ { t } & 23 & 25 & 28 & 24 \
\hline
\end{array}$$
-Suppose that we calculate the four-period moving average of the following time series $$\begin{array} { | c | c c c c c c | } 
\hline \boldsymbol { t } & 1 & 2 & 3 & 4 & 5 & 6 \
\hline y _ { t } & 16 & 28 & 21 & 15 & 26 & 12 \
\hline
\end{array}$$ What is the centered moving average for period 3?

Accepted Answer

The answer of Time periods
The following are the values of...

Question 3

In determining seasonal indexes for the months of the year,a statistician finds the total of the "unadjusted" seasonal indexes is 1150 instead of 1200.What correction must be made to arrive at the adjusted seasonal indexes?

Accepted Answer

The statistician mus

Question 4

All index numbers are unit-less.

Accepted Answer

A) True 
 B)False

Question 5

Different values of the smoothing constant employed in exponential smoothing cause the smoothing procedure to react more or less rapidly to changes in the value of a series.Which of the following smoothing constants causes the least rapid reaction to a change in the current value of a series?

Accepted Answer

A)  0.30 
B)  0.25 
C)  0.15 
D)  0.10 
E)  0.40 
A)  0.30 
B)  0.25 
C)  0.15 
D)  0.10 
E)  0.40

Question 6

When autocorrelation of the residuals is present,what effect can this have on interval estimation and significance tests regarding the regression model involved?

Accepted Answer

When autocorrelation of the re

Question 7

The time series component that reflects a long-term,relatively smooth pattern or direction exhibited by a time series over a long time period (more than two years)is called:

Accepted Answer

A)  trend. 
B)  cyclical. 
C)  seasonal. 
D)  random variation. 
A)  trend. 
B)  cyclical. 
C)  seasonal. 
D)  random variation.

The time series component that reflects variability over short repetitive time periods and has duration of less than one year is called:

Time periods The following are the values of a time series for the first four time periods: 1 2 3 4 23 25 28 24 -Suppose that we calculate the four-period moving average of the following time series 1 2 3 4 5 6 16 28 21 15 26 12 What is the centered moving average for period 3?

In determining seasonal indexes for the months of the year,a statistician finds the total of the "unadjusted" seasonal indexes is 1150 instead of 1200.What correction must be made to arrive at the adjusted seasonal indexes?

All index numbers are unit-less.

Different values of the smoothing constant employed in exponential smoothing cause the smoothing procedure to react more or less rapidly to changes in the value of a series.Which of the following smoothing constants causes the least rapid reaction to a change in the current value of a series?

When autocorrelation of the residuals is present,what effect can this have on interval estimation and significance tests regarding the regression model involved?

The time series component that reflects a long-term,relatively smooth pattern or direction exhibited by a time series over a long time period (more than two years)is called:

A Preview of Business Statistics

Visual Description of Data

Statistical Description of Data

Data Collection and Sampling Methods

Probability: Review of Basic Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Estimation From Sample Data

Hypothesis Tests Involving a Sample Mean or Proportion

Hypothesis Tests Involving Two Sample Means

Analysis of Variance Tests

Chi-Square Applications

Nonparametric Methods

Simple Linear Regression and Correlation

Multiple Regression and Correlation

Model Building

Decision Theory

Total Quality Management

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Exam 18: Models for Time Series and Forecasting

The time series component that reflects variability over short repetitive time periods and has duration of less than one year is called:

Time periods The following are the values of a time series for the first four time periods: 1 2 3 4 23 25 28 24 -Suppose that we calculate the four-period moving average of the following time series 1 2 3 4 5 6 16 28 21 15 26 12 What is the centered moving average for period 3?

In determining seasonal indexes for the months of the year,a statistician finds the total of the "unadjusted" seasonal indexes is 1150 instead of 1200.What correction must be made to arrive at the adjusted seasonal indexes?

All index numbers are unit-less.

Different values of the smoothing constant employed in exponential smoothing cause the smoothing procedure to react more or less rapidly to changes in the value of a series.Which of the following smoothing constants causes the least rapid reaction to a change in the current value of a series?

When autocorrelation of the residuals is present,what effect can this have on interval estimation and significance tests regarding the regression model involved?

The time series component that reflects a long-term,relatively smooth pattern or direction exhibited by a time series over a long time period (more than two years)is called:

A Preview of Business Statistics

Visual Description of Data

Statistical Description of Data

Data Collection and Sampling Methods

Probability: Review of Basic Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Estimation From Sample Data

Hypothesis Tests Involving a Sample Mean or Proportion

Hypothesis Tests Involving Two Sample Means

Analysis of Variance Tests

Chi-Square Applications

Nonparametric Methods

Simple Linear Regression and Correlation

Multiple Regression and Correlation

Model Building

Decision Theory

Total Quality Management

Filters