Keith tabulated the following values for time spent napping in minutes of six of his friends: 23, 35, 17, 30, 20, and 19. The standard deviation is 7.043. Keith reads that the mean nap is 22 minutes. t equals fraction numerator x with bar on top minus mu over denominator begin display style bevelled fraction numerator s over denominator square root of n end fraction end style end fraction The t-statistic for a two-sided test would be . Answer choices are rounded to the hundredths place. 0.70 1.43 1.39 2.88