Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. Patients in a hospital are classified as surgical or medical. A record is kept of the number of times patients require nursing service during the night and whether or not these patients are on Medicare. The data are presented here: The evidence Medicare Yes P-value = i No Patient Category Surgical Medical 52 46 36 Test the hypothesis (using a = 0.40) that calls by surgical-medical patients are independent of whether the patients are receiving Medicare. Find to 2 decimal places the P-value for this test. sufficient to claim that surgical-medical patients and Medicare status are dependent. 43

Check whether the calls by surgical-medical patients are independent of whether the patients are receiving Medicare.

The hypotheses are given below:

Null hypothesis:

: The calls by surgical-medical patients are independent of whether the patients are receiving Medicare.

Alternative hypothesis:

: The calls by surgical-medical patients are not independent of whether the patients are receiving Medicare.

Rejection Rule:

If p-value  (=0.40), then reject the null hypothesis.

The test statistic and the p-value is obtained by using Excel.

EXCEL (PH STAT in Add-Ins) procedure:

Step 1: Choose PH Stat > Multiple-Sample Tests > Chi-Square Test.

Step 2: In Data, enter the values of Level of Significance, Number of Rows as 2, and Number of Columns as 2.

Step 3: In Output Options, Select the appropriate Title.

Step 4: Click OK.