1. Counselling cell of a college keeps conducting sessions with the problematic students by using different methods. Since the number of visitors keeps increasing every day in the center, they have decided to test whether audio visual based counselling and personal counselling are equally effective in reducing the stress level. Eighteen women students were randomly chosen among those who visited the center. Nine of them were given the personal counselling, whereas the other nine were given the sessions with the audio-visual presentation. After the session, the students were tested for their stress level. The data obtained are shown below:

Personal counselling	27	22	28	21	23	22	20	31	26
Audio visual Counselling	35	28	24	28	31	22	33	34	30

Test your hypothesis at 1 level, whether any one method of counselling is better than other It is assumed that population variances are equal and both the populations are normally distributed