This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
The significance of difference between propoions can also be tested by- 
Select and explain. 
A. .'t' test, B. Chi square test, C. ANOVA, D. Correlation and regression
B: Chi square test
Answer: B: Chi square test 
Explanation: * Chi-Square test offers a method of testing the significance of difference between the propoions. * Its advantage lies in the fact that it can also be used when more than two groups are to be compared. * By using this test, we can find out if the difference between two propoions or ratios has occurred by chance. The steps involved are- 1) Testing the null hypothesis. 2) Applying chi-square test. 3) Calculating the degree of freedom. 4) Comparing with probability tables.