The Quarterly Earnings of a Large Microcomputer Company Have Been

Essay

The quarterly earnings of a large microcomputer company have been recorded for the years
1993-1996. These data (in millions of dollars) are shown in the accompanying table. $$\begin{array}{l}\text { Year }\\\begin{array} { | c | c c c c | } \hline \text { Quarter } & 1993 & 1994 & 1995 & 1996 \\\hline 1 & 60 & 65 & 68 & 74 \\2 & 75 & 83 & 85 & 90 \\3 & 93 & 98 & 102 & 106 \\4 & 62 & 69 & 71 & 75 \\\hline\end{array}\end{array}$$ Using an appropriate moving average, measure the quarterly variation by computing the seasonal (quarterly) indexes.