Elementary Stats Exam 3

Positive relationship

Both up or both down

Negative correlation

One up one down

Pearson’s Correlation Coefficient

r, a number between -1 and 1 that describes the linear relationship between pairs of measurement variables

What does the sign of r indicate

(-/+) indicates type of relationship

value of r indicates what

The strength of linear relationship 1.00 is the strongest and 0 is no relationship

Scatterplot scatterdiagram

A graph of the individual data points from a set of xy points

Coefficient of determinant

The proportion of variability in the y-variable that is accounted for by the x-variable

Multiple regression

utilize several variables to make predictions ex. Weather

Simple linear regression

Utilize the relationship to make the prediction; 1 variable to predict another

Criterion variable

the variable that is being predicted, always y variable

Predictor variable

The variable that the prediction is being made from, always x-variable

Least squares criterion

The variability around the line will be at a minimum and guaranteed best fitting line

Standard error of the estimate

The standard distance from the actual data points to the regression line, tells us how far “off” we are in our prediction