Methods (Edexcel A-Level Psychology): Flashcards
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Practise the cards
10 cards from this deck
Purpose of inferential statistics
Purpose of inferential statistics
Determine if IV produced real effect on DV, not chance
Standard significance level in psychology
Standard significance level in psychology
p < 0.05 (5% or 1 in 20 probability)
Type 1 error definition
Type 1 error definition
False positive - reject null when no real effect exists
Type 2 error definition
Type 2 error definition
False negative - retain null when real effect exists
Nominal data
Nominal data
Categorical data - frequency counts in each category
Ordinal data
Ordinal data
Ranked data - order/position, unequal intervals
When to use Wilcoxon Signed Ranks test
When to use Wilcoxon Signed Ranks test
Ordinal+ data, repeated measures/matched pairs, difference
When to use Mann-Whitney U test
When to use Mann-Whitney U test
Ordinal+ data, independent groups, testing difference
One-tailed test usage
One-tailed test usage
When direction of difference can be predicted (directional)
Critical value rule for Wilcoxon & Mann-Whitney
Critical value rule for Wilcoxon & Mann-Whitney
Calculated value must be ≤ table/critical value