1:- How many types of correlation depending on its extent and direction? Q. 2:- To get admission in Bachelors in Public Health, Saudi electronic University conducted an intelligence test to a small group of students. The following results obtained in that test, as under: Student sID 1 2 3 4 5 6 7 8 Intelligence Test Scores 7 6 5 7 8 9 6 8 Marks in Examination 10 7 4 5 4 7 4 7 Calculate the coefficient of correlation as a measure of closeness of association between the two variables Q1. State the situation when Fisher's exact test can be .used? Give an example Q2. In a health Insurance experiment performed in a Super Specialty Hospital 4 types of insurance categories patients are expected to occur in the proportion of 9: 3: 3: 1. The observed frequencies are 891 Insured and Surgical, 316 Uninsured and surgical, 290 Insured and medical, 119 uninsured and medical. Find out expected observations and deviation. Q3. In a prospective study, Data collected extensive information on incidence of coronary heart disease (CHD) among smoker and nonsmoker individuals. The table below summarizes the results Risk factor Cases of CHD Non cases of CHD Smoker 84 2916 Non smoker 87 4913 Total 3000 5000 (a) What is the absolute risk of CHD among smokers? (b) What is the relative risk of CHD when men smoke extensively compared to men who do not smoke? (c) Interpret this relative risk Q1. Using the table below, compute the spearman rank correlation coefficient for the aggressiveness scores. Does this suggest that both twins tend to be similar in degrees of aggressiveness? 1st born 2nd born Ranked pair Term r(x1)r(y1) aggressiveness aggressiveness (x.y) scores (rank) x scores (rank) y 1 85(8) 88(10) (8,10) 80 2 71(3.5) 78(7) (3.5,7) 24.5 3 79(6.5) 75(5.5) (6.5,5.5) 35.75 4 69(1) 64(2.5) (1,2.5) 2.5 5 92(12) 96(12) (12,12) 144 6 72(5) 72(4) (5,4) 20 7 79(6.5) 64(2.5) (6.5,2.5) 16.25 8 91(11) 89(11) (11,11) 121 9 70(2) 62(1) (2,1) 2 10 71(3.5) 80(9) (3.5,9) 31.5 11 89(10) 79(8) (10,8) 80 12 87(9) 75(5.5) (9,5.5) 49.5 Q2. In your words, demonstrate your understanding on the following concepts: a) Survival analysis b) Life table c) Kaplan-Meier curve d) Logrank test e) Negative exponential survival distribution f) Cox proportional hazards modelling Twin set