Correlation Coefficient and Trendline

The ___________________, also knows as the r-value, is a measure of how well the data points fit the trendline. It is a number between -1 and 1.

• correlation coefficient

• residual

• slope

• y-intercept

Which r value best represents this set of data?

• r = 0.9

• r = 0.1

• r = -0.1

• r = -0.9

Which r value best represents this set of data?

• r = 0.9

• r = 0.1

• r = -0.1

• r = -0.9

Which r value best represents this set of data?

• r = 0.9

• r = 0.1

• r = -0.1

• r = -0.9

Which r value best represents this set of data?

• r = 0.9

• r = 0.1

• r = -0.1

• r = -0.9

Predictions can be made using the trendline. An __________ is a prediction about a point within the domain, whereas an _____________ is a prediction about a point outside of the domain.

• extrapolation ... interpolation

• interpolation ... extrapolation

• intercept ... extracept

• introvert ... extrovert

represented by r; a number between -1 and 1 that indicates the direction and strength of the relationship between two variables

• common

  difference

• correlation

  coefficient

• residual

• trend

  line

shows a correlation between two variables

• trend

  line

• line of

  best fit

• scatter

  plot

• data

  table

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