Amount of Alcohol consumption amongst a group of Alcoholics, before and after intervention was recorded. The most appropriate statistical test to assess 'significant change' from the intervention programme would be -

Ans. is 'a' i.e., Paired t test The recommended test for 'within group' comparisons such as comparison between Pre-intervention and Post-intervention values of the same group (such that every paicipant is in both groups) is the paired 't' test (Dependent `I' test).