Levels of Measurement: Nominal, Ordinal and Interval
Levels of measurement decide which statistical test you are allowed to run, and AQA devotes 25 to 30 per cent of the entire Psychology assessment to r…
Tag: research methods
Which Statistical Test to Use in Psychology: A Decision Guide
In a review of 513 neuroscience papers, of the studies where a particular comparison mattered, 79 used the wrong statistical procedure and only 78 use…
The Sign Test: Formula, Worked Example and Critical Values
In 1710, a royal physician counted London christening records for 82 straight years, found boys outnumbered girls every single year, and published wha…
Standard Error Explained: Formula, Meaning and SD vs SE
Standard error is mistakenly reported instead of standard deviation in up to 64% of published articles. Understanding the standard error formula, and exactly how it…
Standard Deviation in Psychology: Definition & Calculation
Two psychology classes can score identical averages yet tell completely different stories — standard deviation is the single statistic that reveals whether those scores clustered…
MBTI Criticisms: Valid Concerns and Unfair Attacks
MBTI criticisms examined: which are valid concerns about reliability and validity, and which attacks miss the mark. A balanced, evidence-based analysi…
Gender and Cultural Bias: Toward Inclusive Psychology
Explore gender and cultural bias in psychology: androcentrism, WEIRD populations, ethnocentrism. Learn to identify bias for inclusive research.
Statistical Significance: P-values, Errors & Effect Sizes Guide
Master statistical significance with our comprehensive guide to p-values, Type I/II errors, and effect sizes for evidence-based decisions.
Content Analysis: Quantitative vs Qualitative Research Guide
Complete guide to content analysis: quantitative vs qualitative methods, step-by-step procedures, software tools, quality standards.