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FAIR TESTS

FAIR TESTS. What is a fair test?. An investigation where only one factor is changed while all others are kept the same (controlled). This way, the changes are due only to the thing we want to test

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FAIR TESTS

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  1. FAIR TESTS

  2. What is a fair test? An investigation where only one factor is changed while all others are kept the same (controlled). This way, the changes are due only to the thing we want to test e.g. if testing the effect of amount of light on growth of seedlings, keep everything else the same e.g. type of soil, amount of water, temperature, length of time grown etc.

  3. Variables • The things that can change in an experiment are called variables. e.g. in the seedling experiment, variables were amount of light, amount of water, temp, soil type….

  4. There are different types of variables in an investigation: • Independent variable: the thing that is changed on purpose • Dependent variable: the thing that is measured • Controlled variables: all other changeable factors that must be kept the same to ensure a fair test

  5. Reliability • How consistent (or similar) the results of a test are when repeated under identical conditions • Precise

  6. Validity • How well a test measures what it is supposed to be measuring • Accuracy

  7. Bathroom scales… An example to show the difference between reliability and validity: You weigh 55 kg. You test your bathroom scales by standing on them 10 times. • If they read 55 kg each time, the test is valid (accurate) andreliable (consistent) • If they read ’45 kg’ each time, the measurement is reliable (consistent) but not valid (accurate) • If they read close to 55 kg each time, but not exactly e.g. 54, 56, 55, 56, 56, 54…, the test is valid (accurate), but not reliable (consistent)

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