I. Choose the correct answer from the choices given: 5 × 1 = 5 1. Who defined Statistics as “The science of counting”? a) Boddington b) A.L.Bowley c) Horace Secris t d) Croxton & Cowden
2. Classification on the basis of variable is a) Chronological b) Geographical c) Qualitative d) Quantitative
3. Geometric Mean of 4 and 9 is a) 2 b) 3 c) 6 d) 36
4. A jar contains 24 marbles, in which some are green and others are blue. If the probability of a green marble is 2/3, then what is the number of green marbles in the jar? a) 16 b) 8 c) 2 d) 24
5. V(-X+2) is equal to a) – V(X) b) V(X) c) 0 d) V(X)+4
II. Fill in the blanks by choosing appropriate answer from those given in the brackets: (Event, 2, Percentiles, 100, Frequency, 3) 5 × 1 = 5 6. The number of observations belongs to a class is _________ 7. The values which divides the data into 100 equal parts are ______ 8. For a mesokourtic curve the value of β2 is ______ 9. A set of outcomes of a random experiment is an _____ . 10. The value of E(2) is ________
III. Match the following: 5 × 1 = 5 A B 11. The data collected for the first time (a) Ogives 12. Graph used to used to find median (b) 0 13. Average growth rate (c) Skewness 14. Lack of symmetry (d) Geometric Mean 15. The probability of null event (e) Primary data (f) Investigator
IV. Answer the following questions: 5 × 1 = 5 16. Mention a need of diagrams. 17. What is range? 18. For a data, if the value of Q2 is 20, then what is the value of D5? 19. Mention an assumption of Interpolation. 20. Define a random variable.
V. Answer any FIVE of the following questions: 5 × 2 = 10 21. State two characteristics of Statistics. 22. Mention two stages of statistical enquiry. 23. If n1 = 6, n2 = 4, X 1= 35 and X 2 = 85, then find combined arithmetic mean. 24. If Q1 = 10, Q2 = 30 and Q3 = 60, then find Bowley‟s coefficient of skewness. 25. If Cov(X,Y) = 12, SD(X) = 4 and SD(Y) = 5, then find „r‟. 26. What is the difference between coefficient of correlation and association of attributes? 27. If P(A∪B)= 0.7, P(A) = 0.6 and P(B) = 0.5, then find P(A∩B). 28. If E(X) = 10 and E(Y) = 5, then find E(X+Y).
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