Instruction 14-7
the Monthly Advertising Expenditures of a Department Store

Instruction 14-7
The monthly advertising expenditures of a department store chain (in $1,000,000s) were collected over the last decade. The last 14 months of this time series follows:
$\begin{array}{cc}\text { Month } &\text { Expenditures }\\&(\$)\\1 & 1.4 \\2 & 1.8 \\3 & 1.6 \\4 & 1.5 \\5 & 1.8 \\6 & 1.7 \\7 & 1.9 \\8 & 2.2 \\9 & 1.9 \\10 & 1.9 \\11 & 2.1 \\12 & 2.4 \\13 & 2.8 \\14 & 3.1\end{array}$

-Referring to Instruction 14-7,advertising expenditures appear to be increasing in a linear rather than curvilinear manner over time.