Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the table below. Sales Price $12 $11 $10 $9 4 10 $8 8 $7 10 Run a regression with sales as the dependent variable. Test the hypothesis that the slope is 0, i.e. that the price has no impact on the sales. What is the t-statistic for your test? Answer to 4 decimal places.