Question

15.22 In some tests of healthy, elderly men, a new drug has restored their memories almost to the level of young adults. The medication will soon be tested on patients with Alzheimer's disease, the fatal brain disorder that eventually destroys the minds of those afflicted. According to Dr. Gary Lynch of the University of California, Irvine, the drug, called ampakine CX-516, accelerates signals between brain cells and appears to significantly sharpen memory." In a preliminary test on students in their early 20s and on men aged 65-70, the results were particularly striking. The accompanying data are the numbers of nonsense syllables recalled after 5 minutes for ten men in their 20s and ten men aged 65-70 who had been given a mild dose of ampakine CX-516. Do the data provide sufficient evidence to conclude that there is a difference in the number of nonsense syllables recalled by men in the two age groups when older men have been given ampakine CX-516? Give the associated p-value. Age Group 20s 65-70 (with ampakine CX-516) 11 1 7 9 Number of syllables recalled 6 8 6 9 2 10 6 8 7 8 5 7 3 10 6 3

Answer 1

- Mi = mean no. of syllables recolled by 20s. M₂ = mean no. of syllables recolled by 65-70 I To test, Ho: Mi = lr us, the Mi & M2, from the deta, we set: nan2= 10 = 6,8, h = 6.4 'S, 2,86, Sze 276. ise pooled sid, a Thiels?+ (12-1) ² e n V init-na-2 Test statistica ta se u to ho tnit rascanned with a tig ta 0.318 all CamScanner 3 2.8, - vñitno GENESIS



P-due z axP (tie > 0,316) = [0. 754. Since p-value >x=0.05 ( level of significence), we had fail to There is sufficient evidence to conclude that there is a difference in the member or nyelables recoleed by man C h the one? Pith age groups, Co CamScanner