Linear Regression Quiz Review

Given the following table. Use your calculator to find the line of regression. Round slope and y-intercept to the nearest tenth.

• $y=1.3x-2.9$

• $y=2.9x+1.3$

• $y=1.2x-2.8$

• $y=1x-3$

Using the equation

 $y=1.3x-2.9$ predict how many seconds it will take 100 people to do the wave?  

• 127

• 127.1

• 10

• 10.1

Using your regression line y = 1.3x - 2.9, predict how many people can do the wave in 300 seconds

• 230 people

• 387 people

• 228 people

• 233 people

What is the correlation coefficient (r-value) and what does it say about the line?

• -.99 weak negative relationship

• -.99 strong negative relationship

• .99 strong positive relationship

• .99 weak positive relationship

What does the following correlation coefficient (r-value) indicate?

r = .62

• strong positive relationship

• weak positive relationship

• strong negative relationship

• weak negative relationship

What does the following correlation coefficient (r-value) indicate?

r = -0.98

• strong positive relationship

• strong negative relationship

• weak negative relationship

• weak negative relationship

What does the following correlation coefficient (r-value) indicate?

r = 0

• strong positive relationship

• strong negative relationship

• no relationship

• weak positive relationship

Given the following scatter plot, name the type of correlation.

• Positive

• Negative

• No correlation

Given the following scatter plot, name the type of correlation.

• Positive

• Negative

• No correlation

Given the following scatter plot, name the type of correlation.

• Positive

• Negative

• No correlation