May 2016 Q6
a) i) Distinguish between a Sample and a Population. (2 marks)
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A sample is a subset of the population under study.
A population is set of all objects under consideration.
ii) Distinguish between a Statistic and a Parameter. (2 marks)
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A Statistics is an estimate from the sample.
A Parameter is an estimate from the population.
b) Use the sample data below to answer the following questions:
Required:
i) Calculate the sample mean, variance, and standard deviation for X. (5 marks)
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ii) Calculate the sample mean, variance and standard deviation for Y. (5 marks)
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iii) Calculate the sample covariance between X and Y. (3 marks)
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iv) Calculate the sample correlation between X and Y. (3 marks)