Distributions (AQA A-Level Psychology): Flashcards
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Practise the cards
10 cards from this deck
Normal distribution
Normal distribution
Even spread both sides of mean, symmetrical bell-shaped curve
Mean, median, mode in normal distribution
Mean, median, mode in normal distribution
All occur at same central point
% scores within 1 SD of mean (normal distribution)
% scores within 1 SD of mean (normal distribution)
Approximately 68%
Positive skewed distribution
Positive skewed distribution
High extreme scores, long right tail, scores cluster low
Negative skewed distribution
Negative skewed distribution
Low extreme scores, long left tail, scores cluster high
Effect of skew on the mean
Effect of skew on the mean
Mean pulled towards direction of skew
Bimodal distribution
Bimodal distribution
Two distinct peaks/modes, suggests two groups in data
Type of test: sign test
Type of test: sign test
Non-parametric statistical test
Sign test data requirements
Sign test data requirements
Nominal level data & repeated measures design
Statistical significance criterion
Statistical significance criterion
Observed value ≤ critical value