Data interpretation-psych

standard deviation

number that shows how far numbers are from the mean

normal distribution

a continuous probability graph where data is around a central average

difference between positively skewed and negatively skewed distributions

positive means it is skewed to the right, negative means the left

bimodal distribution

2 peaks in a data set

regression towards mean

extreme 1st measurement is likely to be followed by second measurement that is closer to average (goes down)

different between effect size and statistical significance

statistical tells if a result is real due to chance, effect tells how large/important the result is in the real world

small effect size

difference between groups/relationship between variables is subtle, minimal, or barely noticeable

p value of .5

50% probability that you would see results as extreme as your data by random choice alone