The Following Information on the Seasonal-Irregular Component Values Is for a Quarterly

question 40

Multiple Choice

The following information on the seasonal-irregular component values is for a quarterly time series: $\begin{array}{l} & \text { Seasonal-Irregular } \\ \text { Quarter } & \text { Comp onent Values (StIt) } \\1&1.23,1.15,1.16 \\2&.86, .89, .83 \\3&.77, .72, .79 \\4&1.20,1.13,1.17\end{array}$ The seasonal index for quarter 1 is ______.

• A) .997
• B) 1.18
• C) 4
• D) 3

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Definitions:

Range

The difference between the highest and lowest values in a data set, indicating the spread of values.

Standard Deviation

A quantification method for assessing the spread or variability within a dataset.

Interquartile Range

A measure of variability, defined as the difference between the 75th and 25th percentiles of a data set.

Interquartile Range

The difference between the 75th and 25th percentiles of a data set, representing the middle 50% of the data.