RM 4 (inferential stats)
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25 Terms
descriptive statistics
analysing data at face value to see any patterns or trends
inferential statistics
to see if any difference or relationship is significant
what is the general level of significance
0.05
how many tests do you need to know
8
three questions to decide which test
independent or related, difference or correlation, level of data
type 1 error
level of significance is too lenient (alternate hypothesis is incorrectly accepted)
type 2 error
level of significance is too strict (null hypothesis is incorrectly accepted)
when is the sign test used
when looking for a difference, data is nominal and the design is related
which tailed test for a directional hypothesis
one-tailed test
when is spearmans rho used
looking for a relationship, data is ordinal, design is related
when is chi squared used
when looking for a difference, data is nominal, design is unrelated
when is wilcoxon test used
looking for a difference, data is ordinal or interval, design is related
when us mann whitney test used
looking for a difference, data is ordinal or interval, design is independent
when are parametric tests used
data is interval, data has a normal distribution, variances of the samples assumed to be the same
when is pearson’s R used
when parametric conditions are met, the design is related, looking for a relationship, data is interval
when is the unrelated t-test used
when parametric conditions are met, design is unrelated, data is interval, looking for a difference
when is the related t-test used
parametric conditions are met, looking for a difference, design is related, interval data
parametric tests
related and unrelated t-tests, pearson’s R
correlation co-efficient
shows the direction and strength of the correlation
how are most extraneous variables controlled
a big enough sample
how are most confounding variables controlled
they may require a change in the design
mnemonic
carrots should come mashed with swede under roast potatoes
what does the mneonic stand for
chi, sign, chi, mann-whitney, wilcoxon, spearman’s rho, unrelated, related, pearsons
left side of table
nominal, ordinal, interval
top of the table
independent, matched pairs, correlation
Note 
Flashcards (41)