D Question 9 2 pts The purpose of an experiment is to investigate the effect of vagal nerve stimulation on insulin secretion. The subjects are mongrel dogs with varying body weights. The table below gives the amount of immunoreactive insulin in pancreatic venous plasma just before stimulation of the left vagus and the amount measured 5 min after stimulation for seven dogs. Test the null hypothesis that the stimulation of the vagus nerve has no effect on the blood level of immunoreactive insulin; that is, Ho : /before = /bafter Blood levels of immunoreactive insulin (HU/ML) Dog Before After 1 335 487 2 204 110 3 221 255 4 287 315 5 89 275 6 383 1,459 7 240 297 Calculate for the test statistic value. Express your answer in 3 decimal places. Hint: d, = after score - before score Note: t > 0 3 pts