Scenario 3

Suppose a professor is interested in seeing whether or mints can be used as a successful retrieval cue for course material. To test their hypothesis, they randomly assign sections of their statistics class to receive a mint or receive nothing during their review sessions and, again during their exam. They randomly select a subset of students' scores from each section. Use the data on the next page to help calculate the appropriate t-statistic for the research question and engage in hypothesis testing to determine if the professor's hypothesis was supported.

Participant Number	Group Membership	Exam Scores
1	No Mint	68
2	No Mint	70
3	No Mint	72
4	No Mint	73
5	No Mint	69
6	No Mint	71
7	No Mint	70
8	No Mint	75
9	No Mint	71
10	No Mint	73
11	Mint	77
12	Mint	81
13	Mint	79
14	Mint	80
15	Mint	82
16	Mint	78
17	Mint	81
18	Mint	83
19	Mint	79
20	Mint	80

11. Using the data provided, determine the null and alternative hypotheses. Then determine how many tails this research question has. (2 points)

12. Using the data provided, recreate this table in Excel and use what you have learned to calculate the means for each group and use what you have learned in class to calculate the t-statistic associated with this research question. (3 points)

13. Using Appendix B in your text, the degrees of freedom for this research question, and the number of tails your hypothesis has to determine the t-critical value (1 point).

10. Based on your calculated t-statistic and t-critical value, engage in hypothesis testing. What is your decision regarding the research question (1 point)?