4. Physicians conducted an experiment to investigate the effectiveness of extern

Question

4. Physicians conducted an experiment to investigate the effectiveness of external higp protectors in preventing hip fractures in elderly people. They randomly assigned some people to get hip protectors and others to be the control group. They recorded the number of hip fractures in each group Treatment Hip fracture No hip tracture Total Hip protector 13 640 653 Control 67 1081 1148 Tota 80 1/21 80 Response Lel CZ = U.UL. 1 ne nuli dnu allerna live nypULne ses are where a is the true proportion of injuries with a hip protector and is the true proportion of iniurie wit nouLLne protector.Use a cni square test ° a eterminelT e aata provi ae.suTTICIent expected frequencies, the X-statistic, degrees of freedom, p-value, and conclusion. (Hint: the note at the top of the chi-square table in the back is a good reminder)

Explanation / Answer

chi-square = 14.5006

p-value = 0.00014

There is significant evidence that use of hip protector and hip fractures are indpendent

Observed Hip Protector Control total Hip Fracture 13 67 80 No Hip Fracture 640 1081 1721 Total 653 1148 1801

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