for S3
NOTE : SOME ANSWERS MAY BE WRONG
1. Test statistic = 2 > 1.6449 reject Ho (7 marks)
2. (a) 0.4129 (4 marks)
(b) 0.0455 (5 marks) using 60Var(X)
3. (a) 0.7698 (2 marks)
(b) 0.9836 (4 marks)
(c) (35.31, 35.89) (4 marks)
4. (a) 6/7 (6 marks)
(b) 6/7< 0.8929 accept Ho, no correlation(4 marks)
5. Test statistic = 3.5534 < 5.991 accept Ho, independent (10 marks)
6. Test statistic = 2.7456 < 11.070 accept Ho, could be modelled (12 marks)
7. (a) take 120 full-time and 80 part-time (3 marks)
(b) (1 mark)
(c) test statistic = 2.828 > 2.5758 reject Ho (7 marks)
(d) normality (2 marks)
(e) s=sigma (1 mark)
(f) 2.53> 2.5758 accept Ho (2 marks)
(g) difference is eliminated(1 mark)