A professor wanted to know if her students’ attitudes toward statistics changed by the end of the course, so she asked them to fill out an “Attitudes Toward Statistics” scale at the beginning of the term and at the end of the term.

a. What kind of t test should she use to analyze the data?

b. If the average (mean) at the end of the class was higher than it was at the beginning, is that necessarily a statistically significant improvement?

c. Which situation makes it easier to declare that a certain mean difference is statistically significant: a class with 7 students or a class with 700 students? Explain your answer.