Comparison of Mean Scores from Two Groups

A researcher conducted a study on the test scores of two groups of students who attended different preparation courses for a standardized exam. The scores recorded for Group A (consisting of 12 students) are as follows:

65, 70, 75, 80, 85, 90, 95, 70, 85, 90, 80, 75

And the scores for Group B (also consisting of 12 students) are as follows:

55, 60, 65, 70, 60, 55, 60, 50, 65, 70, 55, 60

Calculate the mean score for each group and determine the relationship between the two means.