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

1. Write your hypotheses

2. Find the expected values

3. Calculate the overall Chi-square value

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

5. Find the CV and p value

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

Answer 1

Expected frequency= row total * column total/ grand total