The Daily Sales Figures Below Have Been Recorded in a Medium-Sized

question 142

Essay

The daily sales figures below have been recorded in a medium-sized insurance company. $\quad\quad\quad\quad\quad\quad\quad\quad\text { Week }$
$\begin{array}{|l|cccc|}\hline\text { Day } & 1 & 2 & 3 & 4 \\\hline \text { Monday } & 38 & 46 & 35 & 59 \\\text { Tuesday } & 40 & 36 & 52 & 53 \\\text { Wednesday } & 17 & 32 & 25 & 28 \\\text { Thursday } & 20 & 17 & 28 & 33 \\\text { Friday } & 26 & 20 & 32 & 20\end{array}$ a. Compute the three-day and five-day moving averages.
b. Plot the series and the moving averages on the same graph.
c. Does there appear to be a seasonal (weekly) pattern?