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Aspect	Simple Random Sampling	Stratified Random Sampling
Definition	A sampling method where each individual in the population has an equal and independent chance of being selected for the sample.	A sampling method where the population is divided into distinct strata (subgroups), and a random sample is taken from each stratum.
Sampling Process

X	5	8	10	12	13	15	17	16
Y	8	12	14	10	13	16	14	17

b) Define correlation coefficient. What are its properties?

 (a) Calculate mean, median and mode from the following data.

Class Interval	Frequency
3-4	3
4-5	7
5-6	22
6-7	60
7-8	85
8-9	32
9-10	8

(b) Calculate the coefficient of variation from the data given above.