The Following Trend Line and Seasonal Indexes Were Computed from Five

question 145

Essay

The following trend line and seasonal indexes were computed from five years of quarterly observations: $=1800+75 t-2 t^{2}$ . $$\begin{array} { | c c | } \hline \text { Quarter } & S I _ { t } \\\hline 1 & 0.575 \\2 & 0.825 \\3 & 1.225 \\4 & 1.375 \\\hline\end{array}$$ Forecast the four quarterly values for next year.

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Definitions:

Test Statistic

A calculated value used in statistical testing to determine if the null hypothesis can be rejected.

Distribution

A mathematical description of observed or theoretical frequencies of occurrence of different possible outcomes in a dataset.

Sampling Distribution

The probability distribution of a given random-sample-based statistic, used to make inferences about a population.

Mean

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