Chapter 5

Exercise: 5.20

Also:

1. Test how well the verbal SAT scores in the gpa data set fit a normal distribution.
2. A study in 1984 examined the strength of Kevlar 49/epoxy, a material used in the space shuttle. The times to failure (in hours) of 101 strands at a stress level of 90% were found to be:

.01, .01, .02, .02, .02, .03, .03, .04, .05, .06, .07, .07, .08, .09, .09, .10, .10, .11, .11, .12, .13, .18, .19, .20, .23, .24, .24, .29, .34, .35, .36, .38, .40, .42, .43, .52, .54, .56, .60, .60, .63, .65, .67, .68, .72, .72, .72, .73, .79, .79, .80, .80, .83, .85, .90, .92, .95, .99, 1.00, 1.01, 1.02, 1.03, 1.05, 1.10, 1.10, 1.11, 1.15, 1.18, 1.20, 1.29, 1.31, 1.33, 1.34, 1.40, 1.43, 1.45, 1.50, 1.51, 1.52, 1.53, 1.54, 1.54, 1.55, 1.58, 1.60, 1.63, 1.64, 1.80, 1.80, 1.81, 2.02, 2.05, 2.14, 2.17, 2.33, 3.03, 3.03, 3.24, 4.20, 4.69, 7.89

Test how well an exponential distribution fits these data.