Bargain Department Stores, Inc., is a chain of department stores in the Midwest. Quarterly sales of the "Bargain $8000-$Btu Air Conditioner" over the past three years are as given in Table $17\mathrm{.}7$ below.

$\backslash$table$[[,,,,$Coet,,,,$],[\backslash$table$[[$Year$],[1]],$Ouarter,Sales,$\backslash$table$[[$Term$],[$Constant$]],$SE Coef,T$-$Value I,P$-$Value$],[1,2\mathrm{.}915,,24\mathrm{.}5,100\mathrm{.}4,26\mathrm{.}15,0\mathrm{.}000,S=92\mathrm{.}4244$