102 parts made from alloy 1 and 50 parts made from alloy 2 were subjected to stress tests. 18 parts from alloy 1 and 14 parts from alloy:' 2 did not

what is the test statistic in terms of Alloy1-Alloy2?

102 parts made from alloy 1 and 50 parts made from alloy 2 were subjected to stress tests. 18 parts fromalloy 1 and 14 parts from alloy:' 2 did not pass the test. Can we reject the hypothesis that the proportion of nonpassing parts from alloy 1 is at least as large as the proportion of nonpassing parts from alloy 2 at (1:0.05?Assume independent samples.