<prompt> While testing a hypolidemic drug, serum lipid levels were tested both before and after its use. Which test is best suited for the stastical analysis of the result-Paired T testStudents testChi square testNone of the above  <response>: Ref:Parks 23rd edition pg 852 Here measurement is Quantitative and involves only a single group before and after intervention . So we use paired T test. Tests of significance: Qualitative: Chi- square : 2 or more than 2 groups Mc Nemar test : 1 group. before and after intervention Quantitative: Paired T test: 1 group Student T test unpaired T test: 2 groups Anova: more than 2 groups. 