A Group of 200 Students Takes the Kaplan Course in Hopes

Multiple Choice

A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section.The population standard deviation of the SAT is known to be 100.Use an alpha level of .05 when answering the following questions.What conclusions can be made,based on this test statistic?

A) The score of the students who took the Kaplan course was better than the national mean only because of sampling error.
B) The Kaplan course helped the students score statistically significantly higher than the national mean.
C) The Kaplan course helped the students score statistically significantly lower than the national mean.
D) none of these conclusions can be made