## Introductory Statistics 9th Edition

a. (i) $x±2s, k=2, 1-\frac{1}{2^2} = 3/4*100 = 75% 2365±2(340) = [1685, 3045]$ (ii) $x±3s, k=3, 1-\frac{1}{3^2} = (1-1/9)\times100 = 88.89% 2365±3(340) = [1345, 3385]$ b. $1-1/(k^2) = 0.84$ $K^2 = 1/0.16$ $K = 2.5$