Scatterplots
Correlation
Linear Regression
Formulas
Random
100
measures the outcome of a study
What is response variable
100
measures the direction and strength of the linear relationship between two quantitative variables
What is correlation
100
a straight line that describes how response variable y changes as an explanatory variable x changes
What is regression
100
r= 1/n-1 ∑ Zx Zy
What is correlation
100
if there is not an explanatory/ response distinction, either variable can go on which axis
What is horizontal
200
the most effective way to display the relation between two quantitative variables
What is a scatterplot
200
in order to find the correlation, both variables must be
What is quantitative
200
mathematical model for the data
What is least squares regression line
200
b= r(Sy/Sx)
What is slope
200
the response variable should be plotted on the
What is y axis
300
The response variable is plotted on this axis
What is the y-axis
300
correlation only measures the strength of
What is linear relationship
300
the variable y stands for
What is observed
300
a= ybar - b xbar
What is y-intercept
300
Correlation begins by standardizing what values
What is x and y
400
attempts to explain the observed outcomes
What is explanatory variable
400
correlation is a number always between
What is -1 and 1
400
the rate of change
What is slope
400
y-hat= a+bx
What is Least squares regression
400
we want to minimize the distances between our points and the line in which direction
What is vertical
500
when describing the form of the data, you look for this
What is clusters of data
500
when you change the units of measure, correlation will
What is not change
500
correlation describes the strength of the
What is linear relationships
500
Observed y - predicted y
What is residual
500
each individual in the data appears as what in the plot
What is a point
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