PSY 313 Lecture Notes - Lecture 12: Internal Validity, Convergent Validity, Air Hockey
22 Jan 2018
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Will it produce the same result again and again. How much do we trust the measurements to be accurate. Validity: does the experiment test what the experimenter says it tests. Types of error: observed score or measure = true value +- error (ex. Random error: can be in the instrument or in the person being measured. Because it is random, it cancels our with repeated measures. (example, weight) Systematic error: consistent error (example- scale always adds 2 lbs to the real weight). A perfectly sound measure (body weight) may produce different values. Intrinsic noise: drink a litre of water between two measurments, you may weight more. Because it is random it cancels out with repeated measures of the same decide (so we don"t have to worry about it) 10th grade math test has 10 questions that assess trigonometry, is it reliable: randomly split the test in 2 halves, correlate the scores again one another.
