please need help with statistic homework Page 2 Question 2: In 2014. The Alzheim

Question

please need help with statistic homework

Page 2 Question 2: In 2014. The Alzheimers Association reported that 35% of all people over 65 suffer from Alzheimer's disease. However, individuals who have a history of unhealthy eating and little prysical activty tend to have an even higher incidence of Alzheimer's, The older residents of Puma, Arizona tend to lead a relatively unhealthy lifestyle. They exercise infrequently and have diets low in vegetables and high in saturated fats. Consequently, you suspect that older Puma residents may be at a higher risk for Alzheimer's than in the general U. S. population, To test this assumption, you randomly test nine Puma residents over age 85, and you find that seven of them have Alzheimer's disease. Use this information to answer the following questions.

Explanation / Answer

a) This follows binomial distribution, with probability of success, p=0.65, n=9 and r=3 [font size is too hazy, cannot interpret the p value properly]

P(x=3)=9C3(0.65)^3(0.35)^6=0.04 [Use, P(x,r)=nCr(p)^r(q)^n-r]

b) P(x=5)=9C5(0.35)^5(0.65)^6=0.12

c) P(x>=7)=[P(x=7)+....P(x=9)]=0.04241+0.00797+0.00132+0.00008=0.05178 (the probabilities values are too hazy to interpret, please check].

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