Question

The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes n1 - 15 and n2 - 17 are selected, and the sample means and sample variances are 8.73 and 0.35 respectively for sample 1 and 8.68 and 0.40 respectively for sample 2. Find a 9096 lower-confidence bound on 01/02

Answer 1

n = 15, n2 = 17 - S, = 0.35 , 52 = 0.40 df, un, -1 = 15-1 = 14 df2 = n2-1 = 17-1 = 16 a = 1-0.90 = 0.10 Critical value for lower-confidence limit, Fa Folo, 1.95 321 d 0.10,14,16 The 90% lower.com confidence bound on o 2 = si 52 Fa 2 = 0.35 0.402 1.95321 0.626085 (round as need)