Ap Psych Vocab Statistics

Measure of Central Tendency

a single number that tells the center of the data

Range

Max - Mini= Range

Variance

How spread out the data is form the mean value

Standard Deviation

Number that helps tell how spread out the data is

normal distribution

data stays around the central average, bell curve

Right skew

Tail that extends to higher values

left skew

tail extends towards lower values

bimodal distribution

has two different modes more frequently

correlation

measure that explains the strength and direction of relationship between variables

Positive correlation

Both values move in the same direction

Negative correlation

where 1 variable increases the other one seems to decrease

correlation coefficient

Measure that shows the strength and direction of slope (2 variable)

Statistical significance

Unlikely to have occurred by random chance alone

P-Value

probability of obtaining observed results, if null hypothesis is good

operational Definitions

Clear description of a research measures the concept into category