is student's $t test the right choice can a student's test be used for an open laparoscopic procedure what is a dummy code for a student what variables are used for open surgery and surgical procedure does open conversion need msd test do student's test for rate of conversion can you use an $t-test to compare open surgical procedure which test is correct to do a _t test is a student's $t test the right choice which student test is the right choice can students do _t_ tests how to do a t-test in a laparoscopic procedure can u use the t tests in student's test is student's $t test right is student test right when do you do student's $t test how to measure rate of conversion is student's $t test the right choice which test for coding is the right choice? does student's measure rate for procedure