EDEXCEL AS LEVEL MATHS STATISTICS QUESTIONS AND SOLUTIONS.

EDEXCEL AS LEVEL MATHS
STATISTICS QUESTIONS AND
SOLUTIONS



Population - ANSWER: The whole set of items that are of interest
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Census - ANSWER: Observes or measures every member of a population
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Advantages of a census - ANSWER: It should give a completely accurate result
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Disadvantage of a census - ANSWER: Time consuming and expensive
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Hard to process large quantity of data
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Sample - ANSWER: A selection of observations taken from a subset of the population
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which is used to find out information about the population as a whole
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Advantages of a sample - ANSWER: Less time consuming
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Fewer people have to respond
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Less data than a census
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Disadvantage of a sample - ANSWER: The data may not be as accurate
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The data may not be large enough toggle information about the population
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Sampling Units - ANSWER: Individual units of a population
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Sampling Frame - ANSWER: A list of individually named or numbered sampling units
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Simple Random Sample - ANSWER: A sample where every sampling unit has an
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equal chance of being chosen
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Advantages of Simple Random Sample - ANSWER: Free of bias
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Easy and cheap to implement
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Each sampling unit has equal chance of selection
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Disadvantage of Simple Random Sample - ANSWER: A sampling frame is needed
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Not suitable when the population size is very big
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