choosing a statistical test - A-level Flashcards
statistical test definition
used to determine is a significant difference or correlation exists, and consequently if the null hypothesis should be accepted or rejected
sign test defintion
statistical test used for a difference in scores between two related items. data should be at least nominal
levels of measurement definition
quantitative data can be classified into types or levels of measurement such as nominal, ordinal or interval
spearman’s rho definition
a test for a correlation when data is at least ordinal level
person’s r definition
a parametric test for a correlation when data is at interval level
wilcoxon definition
test for a difference between two sets of scores. data should be at least ordinal and use a related design
mann- whitney definition
test for a difference between two sets or scores. data should be at least ordinal and use an unrelated design
related t-test definition
parametric test for a difference between two sets of scores. data must be interval level with a related design such as repeated measures or matched pairs
unrelated t-test
parametric test for a difference between two sets of scores. data must be interval level with an unrelated design
chi-squared definition
test for an associated between two variables or conditions. data should be nominal level using and unrelated design
what do the results of a stats test show
is the null hypothesis should be accepted or rejected and therefore if the difference is statistically significant
what factors are needed when deciding to use a statistical test
-if it is a difference or correlation
-in the case of difference, what experimental design is being used
-level of measurement
how can you tell if it is a difference or correlation
from the wording of the hypothesis
what designs are related designs
repeated measures and matched pairs
what designs are unrelated designs
independent groups
how many conditions do repeated measures participants do
all conditions
how many conditions do matched pairs do
one condition but are matched on a variable making them related
how many conditions do independent groups do
one condition
conditions for chi-squared
-test of difference
-unrelated design
- nominal data
conditions for mann-whitney
-test of difference
-unrelated design
-ordinal data
conditions for unrelated t-test
-test of difference
-unrelated design
-interval data
conditions for sign test
-test of difference
-related design
-nominal data
conditions for wilcoxon
-test of difference
-related design
-ordinal data
conditions for related t-test
-test of difference
-related design
-interval data
