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): $1 = 7.46, s. = 2.61, n1 = 20 - Group Two (Positive ads): 12 - 9.02, s5 - 4.8, n2 = 20 What is the t-statistic for this test? (Write your answer below, to two decimal places as a POSITIVE value; don't write a negative number or the exam will mark it wrong.)