Suppose Burger King has run a major advertising campaign in the hopes of increasing monthly sales. To investigate the effectiveness of this campaign, Burger King randomly selected six restaurants and recorded the monthly sales before and after the advertising. The given data represents these sales figures in thousands of dollars. Start 3 By 7 Table 1st Row 1st Column Restaurant 2nd Column 1 3rd Column 2 4st Column 3 5st Column 4 6st Column 5 7st Column 6 2nd Row 1st Column After 2nd Column $ 123 3rd Column $ 122 4st Column $ 145 5st Column $ 156 6st Column $ 160 7st Column $ 134 3rd Row 1st Column Before 2nd Column $ 107 3rd Column $ 110 4st Column $ 143 5st Column $ 168 6st Column $ 145 7st Column $ 125 EndTable How many degrees of freedom are there for this hypothesis test