This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Tests, Subject name: Social & Preventive Medicine
A test was done to compare serum cholesterol levels in obese and non-obese women. The test for significance of difference is : 
Select and explain. 
A. Paired T test, B. Student T test for independent variables, C. Chi square, D. Fischer test
B: Student T test for independent variables
Answer: B: Student T test for independent variables 
Explanation: Ans. is 'b' i.e. Student t test for independent variables The variable measured is serum cholesterol which is normally distributed in the population .The two groups are independent of each other