An exam is given to both the fourth period class and the sixth period class. If a student's score is at the 30th percentile in the fourth period class but at the 60th percentile in the sixth period class, which one of the following statements is true?
a. Students in the sixth period class generally performed better on the exam than the students in the fourth period class.
b. A person whose score is at the 15th percentile in the fourth period class will have a score at the 30th percentile in the sixth period class.
c. A person whose score is at the 70th percentile in the sixth period class will have a score at the 40th percentile in the fourth period class.
d. Students in the fourth period class generally performed better on the exam than students in the sixth period class.
e. None of these.
Question 2
When we test a null hypothesis about the difference between two population means, using two independent samples, the test statistic used will be the difference between the observed difference of the sample means and the hypothesized difference of the population means, divided by the estimated standard error.
Indicate whether the statement is true or false
