Categorical data, describes information descriptively rather than numerically., Numerical data, represent values that can be measured and put into a logical order., Data, is the study of collecting, organising, presenting, analysing and interpreting data., Discrete data, can be counted., Continuous data, can be measured., Frequency distribution table, has 3 columns. I Score I Tally I Frequency I, Frequency , is the number of times a result or piece of data occurs., Class intervals, are used when data contains too many numerical values., Mean, the average value, Median, the middle score when the data values are ordered, Mode, the most common data value, Range, the difference between the largest and smallest data values, Primary data, data that you have collected yourself, Secondary data, data that has already been collected by someone else, Independent variable, is the one that you change, Dependent variable, is the one that you measure, Controlled variables, are the ones that you keep the same, Outlier, an extreme value in a data set, Cluster, a group of values around a particular value, If the data contains an outlier, the median is the most appropriate measure of centre because outliers do not affect it, If the data does not contain an outlier, the mean or median could be used as the measure of centre. , Probability, the mathematics of chance, Event, a result or outcome that may occur, Outcome, a particular result of an experiment, Favourable outcome, the outcome that we are looking for, Experiment, a process that allows us to collect data by performing trials, Sample space, the list of all possible outcomes of an experiment.

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