1. I know that senior women between the ages of 65 and 80 can remember an average of 15 unrelated items, given 10 minutes to study a list of 30 items. The standard deviation of this mean is 5. I believe Prevagen can assist memory in this group based upon preliminary data. I EXPECT that the memory for items will be greater for those using standard dosing of Prevagen daily for 3 months. A group of 49 women was tested using the same protocols that established mean. Their mean score was 20 items. Follow the steps outlined in the book. Show the hypotheses, perform the z-test, report the results about whether the test group is significantly higher than the control group.