Term
Qualitative/ Quantitative 

Definition
Qualitative: describe with words Quantitative: describe with numbers. 


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Variable: can be measured and varies Constant: Doesn't vary! 


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Varies as a result of changing the IV/ confounding variable. 


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Term

Definition
Equal distances between measuring points indicates MAGNITUDE.
INTERVAL scale: no absolute 0 point (can have a measure lower than 0 e.g. temperature)
RATIO scale: Have an absolute 0 point (can't get lower than 0). More meaningful than interval because can work out ratios between measures. 


Term

Definition
MEAN, MEDIAN, MODE Only for continuous. **For nominal can calc. mode and frequencies. 


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Range: difference between highest and lowest. Interquartile range: difference between highest/lowest using 50% of the data to get rid of outliers. Moderate outliers I.Q. range x 1.5 Extreme outliers I.Q. range x 3 ** IQ+/ x= outliers 


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S.D. average deviation from mean.
VARIANCE spread of data, takes into account every score (unlike range) amount data varies around the mean. Only for continuous! **Can't compare 

