Question

A teacher uses two different programs to instruct students. Results for each student group on a standardized test are listed below. Which test would be most appropriate to test for a difference between the two programs in terms of the scores that students obtain? Group 1 scores: 59, 60, 61, 63, 64, 69, 70, 72, 75, 82, 86 Group 2 scores: 66, 68, 73, 77, 78, 80, 81, 84, 87,89, 91, 93, 94, 95 Two-sample t-test. O Paired t-test. Wilcoxon rank sum test. Wilcoxon signed rank test. ︵ Sign test.

Answer 1

Answer

First of all, it is not given anywhere in the question, that it is normally distributed or not. So, parametric test like two sample t test and paired t test can not be used in this case.

Sign test is mainly used for median testing, so we can not use sign test in this case

Now, we have to select between wilcoxon rank sum test and wilcoxon signed rank test.

we know that the wilcoxon rank sum test uses samples with unequal sample size whereas wilcoxon signed rank test uses paired samples.

So, we can not use wilcoxon signed rank test here because data is not paired

So, only correct answer is wilcoxon rank sum test. OPION C IS CORRECT ANSWER