Q2. A group of 20 students were given an achievement test under two conditions: (i) when tense (ii) when relaxed. Test the significance of the difference between means at .05 level on the basis of the...

Extracted text: Q2. A group of 20 students were given an achievement test under two conditions: (i) when tense (ii) when relaxed. Test the significance of the difference between means at .05 level on the basis of the following data: Roll No. Score when Score when Roll No. relaxed 20 Score when Score when relaxed 10 tense tense 18 11 10 16 18 22 24 12 13 12 22 20 4 12 10 14 12 14 20 25 16 12 20 22 15 6. 17 18 19 20 16 17 16 18 8 20 21 18 20 24 9. 22 23 19 18 23 10 20 20 20 21 17