<prompt> 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?Chi square testPaired t - testUnpaired t - testANOVA  <response>: Paired students 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 gdL and after treatment was 3.2 gdL; comparison of mean level can be done by Paired students t - test. Unpaired students t - test comparing means -SD in two different group of individuals. Example: Mean HB level of anemia patients was 9.6 gdL and those of hookworm patients was 7.2 gdL; comparison of mean levels can be done by Unpaired students t - test. In the given question, researcher wants to compare mean weight before and after an intervention. So, paired students t - test will be most appropriate statistical test of significance. 