Line of Best Fit, Correlation, & Association/Causation

What type of association does this scatter plot represent?

• positive linear association
• negative linear association
• no association
• nonlinear association

Find the equation of the line of best fit for this table.

• y = -0.18x + 6.47
• y = 6.47x - 0.18
• y = 0.04x - 0.19
• y = -0.18x - 0.19

What is the line of best fit?

• f(x)= 5x+1.82
• cannot be determined
• f(x)= 1.82x + 5.02
• f(x)= 1.1x + 4.2

r=-0.89

• Strong positive 
• Weak positive 
• Strong negative 
• Weak negative 

r=0.3

• Strong positive 
• Weak positive
• Strong negative
• Weak negative 

What type of association does this graph have?

• positive
• negative
• none
• all of the above

The correlation coefficient is a number "r" such that: 

• -1<r<1
• -1>r>1
• -1≤r≤1
• -1≥r≤1

Which example shows CAUSATION? (Which one CAUSED the other to happen.)

• High social media usage and reduced grades.

• Car ran out of gas and being stranded on the side of the road.

• Recess time and number of friends.

Which example shows CAUSATION? (Which one CAUSED the other to happen.)

• Rainfall and time spent reading.

• Eating more butter and increased divorce rates.

• It started raining and the baseball game was delayed.

Which example shows CORRELATION? (The events show correlation, but one thing does NOT cause the other thing to happen.)

• I put water in the freezer and now I have ice.

• The alarm clock went off and I woke up.

• Temperature and the amount of people at the beach.