Make $2$ Graphs $($but combine them into one graph and use the legend option to identify which graph is for the Sales or Moving Average$)$:

a$)$ Sales b$)$ Moving Average

Quarter Data for Car Sales

Year Quarter Sales $(1000\text{'}$s$)4-$MA $2*4-$MA Moving average $(4-$quarter$)$

year $114\mathrm{.}8$

$24\mathrm{.}15\mathrm{.}35$

$365\mathrm{.}65\mathrm{.}475$

$46\mathrm{.}55\mathrm{.}8755\mathrm{.}7375$

Year $215\mathrm{.}86\mathrm{.}0755\mathrm{.}975$

$25\mathrm{.}26\mathrm{.}36\mathrm{.}1875$

$36\mathrm{.}86\mathrm{.}356\mathrm{.}325$

$47\mathrm{.}46\mathrm{.}456\mathrm{.}4$

Year $3166\mathrm{.}6256\mathrm{.}5375$

$25\mathrm{.}66\mathrm{.}7256\mathrm{.}675$

$37\mathrm{.}56\mathrm{.}86\mathrm{.}7625$

$47\mathrm{.}86\mathrm{.}8756\mathrm{.}8375$

Year $416\mathrm{.}376\mathrm{.}9375$

$25\mathrm{.}97\mathrm{.}15$

$38$

$48\mathrm{.}4$