Question

A random sample of stock prices per share (in dollars) is shown. Find the 95% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed. Round the sample variance and the final answers to two decimal places. 6.94 14.75 46.12 10.87 40.25 60.50 28.00 28.25 45.12 13.62 53.81 3.81 43.00 47.50 7.50 12.00 28.37 13.88 Source: Pittsburgh Tribune Review 75.37 Download Data <o<

Answer 1

Sol Iutu val fon vananu conpidan u 2 L 2, n-1 /2 , n1 whw vanane of the anden Saufhe Nomal pepulotio Iutu val for Confi denu deviaty st. (n S2 시2,n-1 1

Here n19 s 433. S44 6 31.526 N 625,18 0.95 ,18 - 0.23 0 7 . 5. confi dene Iutu ral he vananu 18 y 33. SY46 18 x 433.S446 ri 8-2307 31.526 q48.13 247.54

At. duviat 19 x 433 511 18A 433.54 4L 8.2307 31.526 30.79 5. 73