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Reg. No. : ..................................... Name : ........................................
Second Year B.A. Degree Examination, 2009 (Old Scheme ) (Prior to 2006 Admn.) Part – III : Subsidiary – PSYCHOLOGICAL STATISTICS Time : 3 Hours
Max. Marks : 100
Instruction : Answers may be written either in English or in Malayalam. SECTION – A Answer any two of the following questions. Each question carries 20 marks. 1. What are the graphical representations of data ? Discuss the uses of graphical representation. Illustrate the procedure of drawing any one graph. 2. Calculate mean and standard deviation for the following data : 80, 75, 32, 35, 90, 25, 42, 15 3. Discuss the meaning, characteristics and importance of a normal probability curve. 4. Calculate Pearson Product Moment Coefficient of correlation for the set of scores given : X : 15 31 27 21 10 8 18 14 30 26 Y : 20 34 32 30 15 7 32 18 29 24 (2×20=40 Marks) SECTION – B Answer any eight of the following questions. Each question carries 5 marks. 5. Distinguish between parametric and non-parametric tests. 6. What is stratified sampling ? Mention its advantages and disadvantages. 7. What is a percentile ? How is it calculated ?
P.T.O.
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8. In an examination, 25% of students failed, 30% got Second Class, 35% got First Class and 10% got Distinction. Represent this data using an appropriate diagram. 9. What is correlation ? Mention its purposes. 10. Which is the most stable measures of central tendency ? Why ? 11. What is ‘Sign test’ ? When is it used ? 12. Explain Skewness and Kurtosis. 13. Calculate median for the data given below : 81, 29, 84, 32, 33, 18, 36, 27, 30, 74 14. 75 males out of 100 and 80 females out of 120 supported the policy on foreign affairs of India. Test whether the two groups differ significantly in their responses. 15. List out the major assumptions of ANOVA. (8×5=40 Marks)
16. Explain the role of statistics in psychology. SECTION – C
Answer all questions. Each question carries 1 mark. Select the alternative that completes the sentence correctly. 17. An ogive is a a) Frequency curve c) Line graph
b) Percentage frequency curve d) Cumulative frequency curve
18. When the population includes many subgroups, the appropriate sampling technique is a) random b) systematic c) stratified d) quota 19. Type I error is a) Acceptance of true hypothesis c) Acceptance of false hypothesis
b) Rejection of a true hypothesis d) Rejection of false hypothesis
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20. The statistical technique appropriate for testing the hypothesis “boys and girls differ significantly in their mean intelligence score” is a) t-test b) ANOVA 2 d) Correlation c) X -test 21. The sampling technique in which the selection of one element determines all other sample elements a) random b) stratified c) systematic d) quota (5×1=5 Marks) Fill in the blanks. Each question carries 1 mark. 22. The most useful measure of dispersion is ________________ 23. ______________ deals with estimation and inferences of data. 24. If the calculated t-value is less than the tabled value for a given level of significance, the null hypothesis is ______________ 25. X2-value is calculated using the formula Y2 = _______________ 26. The middle most value of a distribution is _____________
(5×1=5 Marks)
State whether each statement is true or false. Each question carries 1 mark. 27. Standard deviation is the square root of variance. 28. In a normal distribution mean, median and mode coincide. 29. ANOVA is a non-parametric test. 30. Median is algebraically (mathematically) defined. 31. Statistically a large sample means n > 30.
(5×1=5 Marks)
Match the following. Each question carries 1 mark. A B 32. Histogram
– cumulative percentage
33. Frequency distribution – relationship between variables 34. Ogive
– quantitative representation of data
35. Correlation
– summary of the data
36. Arithmetic mean
– presentation of data. ––––––––––––––––––––
(5×1=5 Marks)