B4. Based on past research, there is ample evidence suggesting that dementia in seniors is related to a reduction in the volume of the hippocampus (a critical brain structure involved in memory formation). For seniors without dementia, their average hippocampal volume is 2,556 mm3 (st dev = 722); in contrast, for seniors with dementia, their hippocampal volume is only 2,234 mm3. In stage one of your research, you wish to rst replicate this well-established result. If you recruit 20 seniors with dementia, what is your power? (10 marks) BS. After replicating the previous result (question 4) and nding that seniors with dementia had significantly smaller hippocampal volume, you wish to examine whether a new cognitive- behavioral training program may slow down the atrophy (shrinking) of the hippocampal structure in seniors with dementia. Recall that the hippocampal volume of those with dementia was 2,234 mm3 (st dev = 722). The program is easy to administer and costs much less than other programs currently in practice. After providing this new cognitive-behavioral training program to 50 seniors with dementia, you found that their hippocampal volume was 2455 mm3 (st dev = 6'75}. What do you conclude based on your data? Do the seniors with dementia enrolled in your training program differ in terms of the size of their hippocampus compared to those with dementia who did not receive your training? (10 marks) (note: you can do this question completely independently from question 4, you have all the information you need on this page so even if you did not do question 4 this question can be answered) 36. You see the following in a journal article. Two equally sized groups of old and young people were tested and young people (mean = 26.2, st dev = 2.215?) had signicantly higher scores than older people (mean = 24.05, st dev = 2.8?95), (t(48)=2.71, p<.05 a how many people were in each group mark b calculate the effect size using cohen d marks note this can be done at least two ways rearrange formulas for t and or use information to ss determine weighted estimate of variance before calculating d. you think year superbowl was more exciting than previous games. ask your friends rate on scale number indicate excitement get mean then compared data compiled by nfl head ofce indicating that rating all superbowls is do not need perform hypothesis test just say what appropriate why>