I for a Quarterly Time Series, the Initial Step, Using

question 68

Multiple Choice

i. For a quarterly time series, the initial step, using the ratio-to-moving average method, is to remove the seasonal components from the time series using a 3-month centered moving average. ii. In the ratio-to-moving-average procedure, using the median or modified mean eliminates trend.
iii. In the final step, using the ratio-to-moving-average method on quarterly data, the total of the modified means should theoretically be equal to 400 because the average of should be 100.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (i), (ii), and (iii) are all false statements.

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Definitions:

Significance F

A statistical measure used in the analysis of variance (ANOVA) to determine the likelihood that the observed differences among group means occur by chance.

Null Hypothesis

A statistical hypothesis that suggests there is no significant difference between specified populations or no effect.

P-Value

A statistical measure that helps to determine the significance of the results obtained from a test, indicating the probability of observing the results given that the null hypothesis is true.

Level Of Significance

A threshold in hypothesis testing that determines the probability of rejecting the null hypothesis when it is actually true; commonly denoted by alpha (α).