AP Psych Statistics Vocab

z-score vs standard deviation

apply them the same way

impact of extreme scores

mean most affected

skewed graphs

tail determines direction

reliability

consistency

validity

accurate

content validity

subject matter

criterion

now - is it relevant? comparing now to the past

predictive

the future (ex: aptitude tests)

construct

assume something about you

IQ test

how smart you are

standard deviation (SD)

the greater the range, the greater the SD; greater SD = more variability; 0 SD = no variability

correlational coefficient (r)

strength & direction of variables; range from 1 to -1

normal bell curve/distribution

mean, median, mode are same or close to the same; called the three measures of central tendency; remember 68-95-50 rule