Find the standardized test statistic t for a sample with n = 15,x- (x bar) = 4.5, s = 0.8, and ? = 0.05 ifH0: ? <_ (less than or equal to) 4.2. Round youranswers to three decimal places. a. 1.452 b. 1.312 c. 1.728 d. 1.631 Solution t = (xbar - mu) / (stdev/sqrt(n)) t = (4.5 - 4.2) / (0.8/sqrt(15)) t = 1.452 Ans) a 1.452.