Numerical - Data is numbers. e.g.s shoe size, height, rainfall, number of kids in a family, Continuous  - Measurable . Numerical data that can take on a range of values, Discrete - Countable. numerical data that can only take on set values, Bivariate - Data for two variables. Height versus arm span, Univariate  - Data for one variable . ex height , Primary - Data collected by person who's going to use it, Secondary - Data that's already available e.g. internet, Magazines , Population - The entire group being studied., Sample - is a group that is selected from the population., Census - a survey of the whole population, Biased Sample - Sample that does not represent the population, Convivence Sample - method of collecting samples by taking samples that are conveniently located around a location or Internet service., Random Sample - A sample where each thing in the population is equally likely to be chosen , Categorical  - Data is text. e.g favourite phone brand,

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