WAYS OF COLLECTING DATA

WAYS OF COLLECTING DATA

1. Observation (Using historical data)

   • Used to predict whether it will rain on 4 July in Edinburgh, for example.

2. Experiment

   • An experiment is a data collection method where you as a researcher change some variables and observe their effect on other variables.
     • The variables that you manipulate are referred to as independent while the variables that change as a result of manipulation are dependent variables. The dependent variable is the one observed during the experiment.
       • Used to test the probability of an event that can't be predicted, such as the average slices of pizza you would eat at an in-class pizza party, before or after lunch.

3. Equally likely outcomes (Can use Probability and Computer Simulations)

   • Used when the probability of an event can be predicted. For example, selecting a king from a pack of cards

4. Surveys

   • Used when there is no historical data and no way to predict probabilities. Would be used to find what subject is the favourite amongst a class of pupils

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