Q9/20Y/11-12 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 PMB911S - BIOSTATISTICS Time : 3 hrs Max Marks :75

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SECTION – A (10X2=20) Answer ALL Questions 1. What are the precautions while using secondary data? 2. Define measure of central tendency. 3. State the Spearman’s Rank Correlation Co.efficient formula. 4. What is the use of regression equation? 5. State the various methods of non-probability sampling methods. 6. Mention any two differences between sampling error and nonsampling error. 7. Define standard error. 8. What is sampling distribution? 9. State the assumptions underlying analysis of variance. 10. What is the use of analysis of variance? SECTION – B (5X5=25) Answer ALL Questions 11. a) Explain the different measures of dispersion. (or) b) A drug is given to two types of animals. The weight is measured in ten intervals. If consistency is the condition for finding the

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Q9/20Y/11-12 effectiveness of the drug. Find which type of animal is more consistent. Type A Type B Number 10 10 Mean weight 125 130 Standard deviation weight 5 4 12. a) Explain the concurrent deviation method of finding correlation co.efficient with an example. (or) b) Calculate Spearman’s Rank correlation co.efficient between X and Y from the following data. X: 39 65 62 90 82 75 25 98 36 78 Y: 47 53 58 85 62 68 60 91 51 84 13. a) Explain the method of drawing samples by stratified sampling method (or) b) Explain the method of drawing samples by systematic sampling method. 14. a) Explain the test procedure to test the equality of two population means. (or) b) A sample of 900 members is found to have a mean 3.4. Can it be reasonably regarded as a simple sample from a large population with mean 3.25 and standard deviation 2.61? 15. a) Explain the three basic principles of design of experiment. (or) b) Write the ANOVA TABLE for the following Latin Square design which contains four treatments A,B,C,D. A B C D

B C D A

C D A B

D A B C

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Q9/20Y/11-12 SECTION - C (3X10=30) Answer any THREE Questions 16. Explain the different methods of collection of data. 17. Obtain the two regression equations for the following data: X: 23 43 53 63 73 83 Y: 5 6 7 8 9 10 18. Explain the various non-probability sampling methods with their merits and demerits. 19. The theory predicts the proportion of beans in the four groups A,B,C and D should be 9:3:3:1. In an experiment among 1600 beans, the numbers in the four groups were 882, 313, 287 and 118. Does the experimental result support the theory? 20. The following table represents the yield of wheat in bushels per acre for trial plots of land treated with four different levels of fertilizer. Each level was applied to five plots randomly chosen over a field: Treatment Plot Number 1 2 3 4 1 21 24 34 40 2 25 33 26 47 3 31 34 38 39 4 17 39 32 41 5 26 35 33 33 Carry out an analysis of variance and state your conclusion.

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