Edexcel AS Level Maths Statistics chapter 1 Test Questions Fully Solved.

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