Question

A chemistry professor at a large university is trying a new teaching method in which
he has students read material before class and work on problems in class instead of
lecturing. He uses the new method in a class with 123 students, and he just lectures
in another section with 104 students. He gives the same test to both classes. The
class using the new method had a mean of x¯1x¯1 = 84 with a standard deviation of
s1s1 = 7. The class where he just lectured had a mean of x¯1x¯1 = 82 with a standard
deviation of s2s2 = 6. Test the claim that the new method increased test scores. (You
may assume you can use a normal distribution.) Use α = 0.05.

Answer 1

Z test hypothesis for difference of means calculation.