5. You want to see if smoking marijuana has any effect (positiveor negative) on memory span. You pre-test subjects on the memoryspan measure, then pair up subjects who have the same memory testscore.  After matching the subjects, you conduct theactual experiment. One member of each of the 15 pairs of subjectsis assigned at random to smoke a marijuana cigarette; the othermember of each pair is assigned to smoke a cigarette that doesn'tcontain any of the psychoactive ingredient in marijuana, THC(placebo). After smoking, every subject takes the memory span testagain.  The results of this second test are tabled below.Test the relevant hypothesis at the alpha = .05 level.
Pair | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
Marijuana | 4 | 5 | 6 | 6 | 7 | 7 | 6 | 6 | 3 | 4 | 5 | 5 | 6 | 7 | 7 |
Placebo | 5 | 6 | 7 | 6 | 9 | 6 | 5 | 7 | 5 | 5 | 6 | 8 | 7 | 5 | 6 |
