Flashcards
Stats 3 correlations
Cards in this deck (15)
- 1what is a correlation?how variations in one variable are related to variations in another variable
- 2when can you calculate Pearson's r?when you have interval or ratio data
- 3when can you calculate Spearman's Rho?when you have ordinal data
- 4what can you not use correlations for?to infer causality
- 5when should you use correlations?when experimentation is impossible or unethical
- 6what are acceptable values of r for a positive correlation?between 0 and 1
- 7what are acceptable values of negative correlation?0 and -1
- 8what does r represent?to extent to which data points lie on a straight line
- 9according to Cohen what value of r is a small effect?r=.1
- 10according to Cohen what value of r is a medium effect?r=.3
- 11according to Cohen what value of r is a large effect?r=.5
- 12what do p values tell us?the probability of something happening by chance
- 13what is the accepted p value in psychology?p=.05 or less
- 14what does the p value of a correlation depend on?the size of the correlation and the number of data points
- 15how do you calculate r?first calculate standard deviation for both data sets with the addition of (x1-m1)(x2-m2) and the sum of this. Then calculate <-
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- Psychology Methods and Applications Year 1 Semester 2 Flashcards on Stats 3 correlations, created by Elle Milne on 23/04/2018.
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- Elle Milne
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