Edexcel AS Level Maths Statistics Questions with Correct Answers.

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