 Hello and welcome to the session. In this session we will discuss a question which says that identify whether the filming is an observational study or an experiment. If it is an experiment, then identify the control group and treatment group. First part is given as find 80 students and randomly split them in two groups. One group walks up to school and one group does not. And second part is find half of whom walk up to school. Apparently break points are reached. Now before starting the solution of this question, you should know some results. First is, experiments very rarely impairs some treatment on individuals in order to observe their response. The response of treatment group is typically compared to that of a control group which is a group of individuals who are given no treatment and certainly in this study, individuals are observed and no attempt is made to influence them. Now these results will work out as a key idea for solving a given question. Now let us start with the solution of the given question. Students say group 1 after school search which is given as a key idea. We know that in order to observe their response, so from the key idea, now from this result the idea we also do that of a control group. So here treatment group is the group that works after school is the group that does not work after school. So here group 1 is the treatment group and group 2 is the control group. And then their break points are compared have not divided, made no attempt. And from the second result which is given in the key idea, the observed and no attempt is made to influence them. And here also we have not provided the group, made no attempt to influence them to work. So this is the study of the given question. That's all for this session. Hope you all have enjoyed the session.