Question: End Result Hospital has implemented a program to reduce the incidence of pressure ulcers. The table below shows the number of pressure ulcers observed before

End Result Hospital has implemented a program to reduce the incidence of pressure ulcers. The table below shows the number of pressure ulcers observed before and after the program was implemented. Determine the Chitest, critical value, and test statistic. Was the program successful?
Observed Pressure Ulcer No PressureUlcer Total
Preimplementation 11 89 100
Postimplementation 3 97 100
Total 14 186 200
Marginal probability 7% 93% 100%
Expected Pressure Ulcer No Pressure Ulcer Total
Preimplementation 7 93 100
Postimplementation 7 93 100
Total 14 186 200
Chitest 2.66%
Chiinv - test stat 4.92
Chiinv - critical value 3.84

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