Question 9 1.5 pts For the following four questions, use the appropriate formula and your t-Test table in Appendix B2. Use the following study set-up: A researcher is interested in seeing if negative political ads against an opponent (group one) are more persuasive than positive ads for an original candidate (group two). She creates a scale to measure how persuasive the ads are; larger numbers mean more persuasive. She collects the following data (write these numbers down; they don't appear on the followup questions): Group One (Negative ads): X1 = 7.51, s. = 2.56, n1 = 20 . Group Two (Positive ads): X2 = 9.11, s, = 4.8, n2 = 20 What is the t-statistic for this test? (Write your answer below, to two decimal places as a positive value; sign doesn't matter)