GCSE Statistics Keywords Questions & Answers

GCSE Statistics Keywords Questions & Answers Advantages of a census - ANSWER: Unbiased Takes the whole population into account - Accurate Advantages of a sample - ANSWER: Cheaper Less time consuming Easy to manage Bar chart/Line Diagrams/Pictograms - ANSWER: Bar chart in which the length of the rectangle represents the frequency. Line diagrams use lines Pictograms use pictures (with a key) Before and after experiment - ANSWER: An experiment in which the situation before and after change are compared, e.g. Speed limit effects Bivariate data - ANSWER: Data that involve two variables Capture recapture assumptions - ANSWER: The population has not changed The possibility of being caught is the same for every unit Marks are permanent Capture/recapture method - ANSWER: A way of estimating the size of a large population, normally of animals Census - ANSWER: Information about every member of the population Class - ANSWER: Group used for classifying the data Closed question - ANSWER: A question that has a set of answers to choose from Cluster sampling - ANSWER: Clusters are natural groups. A sample of the clusters is selected randomly and observations are taken from each member of these groups.