Question: Supplement Testing

Ginkgo biloba has been touted as a memory enhancing supplement. A pharmaceutical company sets out to determine if their ginkgo biloba supplement actually has a statistically significant effect on memory. In an experiment to test their supplement, volunteer subjects were randomly assigned to take ginkgo biloba supplement or a placebo (fake). Their memory was tested to see whether it improved. The differences in the memory tests for both groups are given in the data file Gingko.xls. Use a two-sample t-test to determine whether the Ginkgo supplement lead to greater memory improvement than the placebo treatment.

1. Do these sets of data have to be normally distributed in order to use the two-sample t-test? Why or why not?
2. Use statistical software to test the following hypotheses (upper-tail test):
   
   Show the software output for the two-sample t-test.
3. At the .05 level of significance, what is the appropriate conclusion to the hypothesis test?
4. Connect the statistical result to real-life: does it appear that this company’s ginkgo biloba supplement enhances memory better than a placebo treatment?

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