Primary - Data you collect yourself, Secondary - Data that someone else has collected, Reliability - The extent to which your results are consistent, Mean - Add up all the numbers and divide by how many numbers there are, Validity - The extent to which your data collection methods helps you to answer your overall investigation question, Conclusion - Drawing together all of your results to answer your overall investigation question, Median - Putting the numbers in order from smallest to biggest and finding the middle number, Sampling - Selecting a group from the population you are going to study,

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