"Cramming" Is a Technique Often Used by Students to Prepare

question 18

Multiple Choice

"Cramming" is a technique often used by students to prepare for exams,in which they study for extended hours only a few days before the exams.Often students drink caffeinated beverages to help them stay awake while cramming for exams.Five students were randomly selected and asked to drink highly caffeinated beverages before their first midterm exam and then drink only water before their second midterm exam in the same subject.The difference of the scores (midterm 2 - midterm 1) is shown below for the five students. Using the normal approximation with the continuity correction,compute the P-value used to test the null hypothesis of no difference against the alternative hypothesis that midterm 2 scores are systematically higher than midterm 1 scores using the Wilcoxon signed rank test statistic.Using a significance level of .05,is there evidence against the null hypothesis of no systematic difference in the scores?

• A)Yes
• B)No

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