A social psychologist is interested measurin the effect of the a e of the author on the persuasiveness of an opinion about Social Security. 18 research participants read a controversial essay about Social Security. Each participant rate the extent to whic he or she agreed with the author (the hi her the number, the more the person agreed with t e author). The icture of the "author" was at the op of the essay. The picture was varied such that 9 of the participants were led to be ieve that the author was a senlor citizen and 9 were led to believe t at the author was younger. The results for the sample led to believe that the author was older are: 1 4,5,3,4 6,3,4,5 The mean of this sample is 3.889. The sample standard deviation is 1.453. The results for the sample led to believe that the author was younger are: 11, 7, 10, 9 1Q, 8, 7, 11,_ 6 The mean of this sample l5 8.778. The sample standard deviation is 1.856. A. What is the estimated standard error for this test? Tries 0/10 B. Using a two-tailed test, what is the critical value of the test statistic used to test the researchers question (alpha=0.05)? Tries 0/10