# WINTER BREAK REVIEW VOCAB Flashcards

What points have leverage in regression?

Those far to the left and right from x-bar

What points are outliers in regression?

Those that don’t follow the flow.

What points have influence in regression?

Those that would change the slope if removed (they are outliers that have leverage)

Interpret r^2 ?

The percent of variablility in Y explained by the model with X

Interpret y-intercept?

When X=0, the model predicts this much Y.

Interpret SLOPE

For every 1 unit of x, there is a change of SLOPE units of y

Find P( Z > 1.5) ?

normcdf( 1.5, 9999)

Describe independence and association with quantitative examples.

Height and IQ are independent. Height and weight are associated.

Describe independence and association with categorical examples.

Grade and pizzsa preference are independent, gender and gaming status are associated

function to find area under normal curve?

normcdf

function to find a percentile in normal model?

INVNORM

What are the measures of spread we use?

standard deviation, variance, range, interquartile range, standard error

What are the measures of center we use?

mean, median, mode

How do you describe the distribution of a single data set? (a histogram)?

SHAPE (#modes, skewness), CENTER (measure of center), SPREAD (measure of spread), STRANGE (outliers or gaps)

How do you describe an association between two quantitative variables? (scatter plot)

DIRECTION (pos/neg) FORM (linear,curved) STRENGTH (strong, moderate, report “r” value)

What does rSy/Sx mean?

slope formula. For each SD in X, you go r SD in y