6. The article \"Mortality Among Recent Purchasers of Handguns\" (New England Jo
ID: 2907970 • Letter: 6
Question
6. The article "Mortality Among Recent Purchasers of Handguns" (New England Journal of Medicine (1999]: 1583-1589) summarized an examination of 4000 randomly selected US death records. Gun registration records were also examined for the 4000 individuals selected to see if a handgun had been purchased within the previous year by the individual. The following table summarizes their finding regarding suicides and handgun purchases. Suicide Not Suicide Handgun purchased within the last year Handgun not purchased 12 3921 63 A. Should this study be classified as an experiment or an observational study. Why? B. Can the large sample approximate Z procedures (CI or 2 sample Z test) for comparing two proportions be used to analyze this data? Why? C. Using an advanced method that gives exact p-values for small samples (it is called the Fisher Exact Test) the researcher reported a p-value-.000 for Ha: PprchanP where p is the proportion of suicides. Is it reasonable to conclude that a ban on legal handgun purchases lower suicide rates? Explain your answerExplanation / Answer
A. this is a cohort study..1st we have selected a cohort of 4000 people and observe their charecreristic under study.There is no choice of further observing the people the study will be done based on past activities so this is a retrospective cohort study.
B.large sample procedures can be used when all the cell frequencies are >5 here 1st one is 4 so large sample approximation won't be good.
C.p-value < 0.05 implies Reject H0 at 0.05 level of significance and conclude that Ppurchase>Ppnot..
which means proportion of hand gun purchasers suicide is greatee than the non puchasers suicide.which readily implies ban on legal handgun purchases will lower suicide rate
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