Question

In an introductory biology class, a total of 40 student volunteers are randomly assigned, in equal numbers. to take the course for either letter grades or a simple pass/fail. At the end of the academic term, the mean achievement score for the letter grade students (X bar subscript 1) equals 86.2, and the mean achievement score for pas/fail students (X bar subscript 2) equals 81.6. The estimated standard error is 1.50.

(a) Use t to test the null hypothesis at the .05 level of significance.

Answer 1