Question

A new postoperative procedure is administered to a number of patients in a large hospital. Do doctors feel differently about this procedure from the nurses.

To answer this question, a researcher selects a sample of nurses and doctors and tabulates the data as shown.

Group Prefer new Prefer Old No

Procedure procedure preference

Obs. Exp Obs. Exp Obs . Exp

Nurses 100 80 20

Doctors 50 120 30

- Write your hypotheses

- Find the expected values

- Calculate the overall Chi-square value

- How many degrees of freedom will you use for this test?

- Find the CV and p value

- At a level of significance of α= 0.05, state your conclusion

Answer #1

Expected frequency= row total * column total/ grand total

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