A study was conducted to test if use of herbal tea played any role in prevention of common cold. Data was collected on the number of people who developed cold and those who did not develop cold and this data was tabulated in relation to whether they consumed Herbal tea or not. The analytical test of choice to test this study is:
A. Student- t test (unpaired)
B. Student- t test (paired)
C. Chi square test
D. ‘Z’ test
Correct answer : C. Chi square test
The test required is a non parametric test (to compare qualitative data). Chi square test a frequently used non parametric test.