AQA Psychology - Research Methods - Choosing a Statistical Test
Ordinal – data in ranked order, but intervals between values are not equal (e.g., race positions) Interval – numerical data with equal intervals between values and no true zero (e.g., temperature in °C)
What is levels of measurement?
Nominal, ordinal or interval
Key Terms
What is levels of measurement?
Nominal, ordinal or interval
What is statistical tests?
Used in psychology to determine whether a significant difference or correlation determining whether the null hypothesis should be rejected or retai...
Which statistical test should be used when containing:
Test of difference
Nominal data
Unrelated design
Chi-squared
Which statistical test should be used when containing:
Test of difference
Ordinal data
Unrelated design
Mann-Whitney
Which statistical test should be used when containing:
Test of difference
Interval data
Unrelated design
Unrelated t-test
Which statistical test should be used when containing:
Test of difference
Nominal data
Related design
Sign Test
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| Term | Definition |
|---|---|
What is levels of measurement? | Nominal, ordinal or interval |
What is statistical tests? | Used in psychology to determine whether a significant difference or correlation determining whether the null hypothesis should be rejected or retained |
Which statistical test should be used when containing: Test of difference Nominal data Unrelated design | Chi-squared |
Which statistical test should be used when containing: Test of difference Ordinal data Unrelated design | Mann-Whitney |
Which statistical test should be used when containing: Test of difference Interval data Unrelated design | Unrelated t-test |
Which statistical test should be used when containing: Test of difference Nominal data Related design | Sign Test |
Which statistical test should be used when containing: Test of difference Ordinal data Related design | Wilcoxon |
Which statistical test should be used when containing: Test of difference Interval data Related design | Related t-test |
Which statistical test should be used when containing: Test of association or correlation Nominal data | Chi-squared |
Which statistical test should be used when containing: Test of association or correlation Ordinal data | Spearman’s rho |
Which statistical test should be used when containing: Test of association or correlation Interval data | Pearson’s r |
What is nominal data? | Data is represented in the form of categories - Discrete |
What can nominal data be referred to? | Categorical data |
What is ordinal data? | Ordered in some way - Does not have equal intervals between each unit |
What does ordinal data lack in? | Precision as based on subjective opinion |
What is interval data? | Based on numerical scale with equal intervals between each unit Public scales of measurements Precise and sophisticated form of data |
What is the relation to nominal data to measures of central (CT) tendency and dispersion (D)? | Mode for CT - N/A for D |
What is the relation to ordinal data to measures of central (CT) tendency and dispersion (D)? | Median for CT - Range for D |
What is the relation to interval data to measures of central (CT) tendency and dispersion (D)? | Mean for CT - Standard deviation for D |