Which of the Following Best Describes What May Be Used

question 59

Multiple Choice

Which of the following best describes what may be used when measuring the seasonal and random variation of a time series with no cyclical effect?

• A)The trend value ŷ.
• B)The ratio of the time series divided by the predicted values.
• C)The ratio of the time series divided by the moving average and the ratio of the time series divided by the predicted values.
• D)The ratio of the time series divided by the moving average.

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Definitions:

Independent

Not influenced or controlled by others; in statistics, refers to variables that are not affected by the changes in other variables.

Normal Distribution

A bell-shaped frequency distribution curve that is symmetric around its mean, describing how values of a variable are dispersed or spread.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values, showing how much each value in the set varies from the mean.

Mean

The average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.