Estimating Correlation on Scatterplot

a statistical index of the relationship between two things (from -1 to +1)

• confounding variable

• standard deviation

• correlation coefficient

• statistical significance

the data is tightly clustered around a best fit line and the correlation coefficient (r) is close to 1 or -1

• strong relationship

• medium effect (goodness of fit)

• foreign key

• correlation coefficient

a line drawn in a scatter plot to fit most of the dots and shows the relationship between the two sets of data

• scatter plot

• slope

• line of best fit

• correlation coefficient

Estimate the correlation coefficient for this scatterplot.

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Estimate the correlation coefficient.

• r=0

• r=-1

• r=1

• r=2

a connection between two variables where as one variable increases, the other variable also increases

• negative relationship

• positive relationship

• causal relationship

• correlation coefficient

an equation that describes a relationship between two variables where the change between them is constant

• interpolate

• linear model

• global surrogate model

• channel

occurs when an increase in one variable is associated with a decrease in the other variable

• correlation coefficient

• weak relationship

• negative relationship

• causal relationship

What type of correlation does the following scatterplot show?

• Positive

• Negative 

• None