62. Pull-strength tests were applied on soldered lead in an electronic apparatus for each of two independent random samples of 12. The lead soldering in the two samples were done using two different techniques. The test results indicate the force required in pounds to break the bond. The data obtained from these two experiments are as follows:

Apparatus 1 2 3 4 5 6 7 8 9 10 11 12 Sample I 21.5 20.6 18.7 22.3 24.1 20.6 19.8 18.7 24.2 22.3 19.5 20.6 Sample II 24.6 23.5 22.5 23.5 22.7 21.5 20.5 23.6 22.5 23.5 21.7 19.9 Assuming that the pull-strengths are normally distributed with variances σ2 1 and σ2 2, respectively, test at the 5% level of significance the hypothesis H0: σ2 1 = σ2 2 versus H1: σ2 1 = σ2 2.