The accompanying table summarizes the sucrose consumption (mg in 30 minutes) of black blowflies inject- ed with Pargyline or saline (control).43 CONTROL PARGYLINE n 900 905 y (bar) 14.9 46.5 s 5.4 11.7 (a) Construct a 95% confidence interval for the differ- ence in population means. [Note: Formula (6.7.1) yields 1,274 degrees of freedom for these data.] (b) Repeat part (a) using a 99% level of confidence. Solution.