This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostats, Subject name: Social & Preventive Medicine
[{'content': 'A researcher wants to evaluate the effect of a new diet regimen on weight of a group of 10 patients. He records their weight before & after the regimen. Which of following statistical test will be applicable in this case? \nSelect and explain. \nA. Chi square test, B. Paired t - test, C. Unpaired t - test, D. ANOVA', 'role': 'user'}, {'content': "Answer: B \nExplanation: Paired student's t - test: Comparing means (+-SD) in paired data.(in same group of individuals before and after an intervention) Example: Mean serum albumin level of dengue patients before treatment was 3.6 g/dL and after treatment was 3.2 g/dL; comparison of mean level can be done by Paired student's t - test. Unpaired student's t - test comparing means (+-SD) in two different group of individuals. Example: Mean HB level of anemia patients was 9.6 g/dL and those of hookworm patients was 7.2 g/dL; comparison of mean levels can be done by Unpaired student's t - test. In the given question, researcher wants to compare mean weight before and after an intervention. So, paired student's t - test will be most appropriate statistical test of significance.", 'role': 'assistant'}]