A university coordinator wonders if there is a difference in total points earned in an introductory psychology class between students taught by method X and those taught by method Y. Two classes with 230 students in each class were selected for the study. The two groups of students were paired on the basis of intelligence and then randomly assigned to one of the two methods.

Which test statistic should we use to analyze these results?

a. 2-independent-sample t test

b. 1-sample t test

c. 2-dependent sample t test

d. Chi-square

The information the university coordinator require to be determined is; The presence of a difference in the points earned by students taught by method X and student taught by method Y.

Number of classes in the study = 2 classes

Number of student in each class = 230 students

Number of groups of students subjected to the two treatment = 2 groups

Experiment design; One of the two groups were assigned to one of the methods, and the other is assigned to the other method.

The analysis of the result of the test given that the there are two independent groups (based on the students have the same intelligence level, and the method of teaching are different), determines if the difference between the mean of the two groups that are unrelated, is statistically significant.

Therefore;

The test statistic that should be used to analyze the result is the 2-independent-sample t-test.

The 2-independent-sample t-test, known also as the two sample t-test, is

used make inferences about two groups under study, on the statistical

significance of the difference between the means of the groups.

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