Edexcel Maths exam 2023 with complete solutions

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