Qualitative Data, Data relating to qualities, usually recorded in words, Quantitative Data, Data relating to quantities, usually recorded with numbers, Discrete Data, Quantitative data that can only take specific values, Continuous data, Data that can take any value and could always be measured more accurately, Primary Data, Data collected specifically for an investigation, Secondary data, Existing data that has been repurposed for an investigation, Hypothesis, An unbiased statement that can be tested to prove or disprove something, Population, ALL the items that are of interest for an investigation, Sample, A portion of the population chosen to represent them, Census, The act of collecting data from every member of a population.

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