Linear Regression

What kind of correlation?

• Positive

• Negative

• No

Describe the relationship between the variables.

• A) Weak positive correlation

• B) Weak negative correlation

• C) Strong positive correlation

• D) Strong negative correlation

Which value below could be the correlation of the scatterplot?

• -0.923

• -0.478

• 0.006

• 0.777

Is r = -0.87 strong, moderate, or weak?

• strong

• moderate

• weak

Find the correlation coefficient (3 sig fgis)

Find the correlation coefficient (round to 3 significant digits)

What kind of correlation?

• Positive

• Negative

• No

Estimate the correlation coefficient for this scatterplot.

• r = -0.9

• r = 1

• r = 0.9

• r = -1

If Joe worked 30 hours, how much is he expected to earn?

• $600

• $200

• $1000

• $800

The correlation coefficient measures...

• whether there is a relationship between two variables.

• the strength of the relationship between two quantitative variables.

• whether a cause and effect relation exists between two variables.

• the strength of the linear relationship between two quantitative variables.