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. Herbal tea Consumed Not consumed Had cold 12 23 Did not have a cold 34 38 In order to study this above given test, which of the following analytical test can be used?
'Z' test Chi square test Student -1 test (paired) Student -1 test (unpaired)