Maths A Level Statistics Questions with 100% 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 Sample Correct Answer selection of observations taken from a subset of the population, which is used to find out information about the population as a whole Census advantages Correct Answer should give a completely accurate result Census disadvantages Correct Answer -time consuming and expensive -cannot be used when the testing process destroys the item -hard to process large quantity of data Sample advantages Correct Answer -less time consuming and expensive than a census -fewer people have to respond -less data to process than in a census Sample disadvantages Correct Answer -the data may not be as accurate -the sample may not be large enough to give information about small sub-groups of the population Sampling units Correct Answer individual units of a population Sampling frame Correct Answer a list of individuals from whom the sample is drawn Simple random sample of size n Correct Answer where every sample of size n has an equal chance of being selected Simple random sampling method 1: Correct Answer generating random numbers Simple random sampling method 2: Correct Answer lottery sampling In systematic sampling Correct Answer the required elements are chosen at regular intervals from an ordered list