4. State the meaning and importance of correlation and compute the degree of correlation from the following data by any method you like
X27 23 24 18 12 10
Y10 30 25 12 18 13

5. Explain with the help of suitable examples the techniques of stratified sampling and systematic sampling.
6. What are index numbers Use imaginary data to prove how Fishers' method satisfies both the Time Reversal and Factor Reversal Tests.

7. What do you understand by Trend of a time series How do we measure it Fit a straight line trend to the following data by any method you know

Year 2005 2006 2007 2008 2009
Production 1100 1300 1400 1500 1600


8. Distinguish between interpolation and extrapolation and state the various methods of interpolation giving examples.

1. Distinguish between primary data and secondary data and discuss the methods of collecting primary data.

2. What do you mean by central tendency Enumerate its various measures and compute the size of Mean and Median for the following data


Marks No. of Students
0 20 15
20 40 12
40 60 13
60 80 06
80 100 05

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3. What is meant by theoretical distributions State and explain the properties of a Normal Distribution.