Does ginkgo biloba enhance memory? Repeat the analysis in Exercise 70, this time using a randomization test to see if the difference in mean number of items recalled is statistically significant. Be sure to include a P-value.

Data From Exercise 70

Does ginkgo biloba enhance memory? In an experiment  to find out, subjects were assigned randomly to take ginkgo biloba supplements or a placebo. Their memory was  tested to see whether it improved. The numbers reported are the  number of items recalled before and after taking a supplement.  Here are boxplots comparing the two groups. At the top of the  next page is some computer output from a two-sample t-test  computed for the data.

Difference in Items Recalled 10 5 O -5 -10 Ginkgo Placebo Treatment