for N = 25, which value of the t student limits the lower 8%? -1.53 -1.45 -1.06 -0.97 for N = 30, which value of the t student limits the upper 10%? -1.31 1.31 1.70 -1.70 for N = 20, which value of the t student limits the central or middle 85%? -2.20 2.20 -1.50 1.50 -1.33 1.3x -1.92 1.92