Correlation and Line of Best Fit Notes

Line of Best Fit

Correlation

Skew of a Graph

Multiple Choice

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

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1

Multiple Choice

What type of association does this scatter plot represent?

• positive linear association

• negative linear association

• no association

• nonlinear association

Multiple Choice

Describe the correlation in the graph shown.

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive

Multiple Choice

What is the type of correlation?

• Negative 
• no correlation
• positive 

Multiple Choice

What type of correlation does this scatter plot show?

• positive

• negative

• no correlation

• nonlinear association

Multiple Choice

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Multiple Choice

Estimate the correlation coefficient for this scatterplot.

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Multiple Choice

r=-0.89

• Strong positive

• Weak positive

• Strong negative

• Weak negative

Multiple Choice

r=0.3

• Strong positive

• Weak positive

• Strong negative

• Weak negative

Multiple Choice

Determine the Correlation Coefficient and decide whether it is weak, moderate, or strong.

• 0.80 weak

• 0.90 moderate

• 0.80 strong

• 0.90 strong

Multiple Choice

Determine the Correlation Coefficient and decide whether it is weak, moderate, or strong.

• 0.07 weak

• -0.26 weak

• -0.26 moderate

• 0.07 strong

Multiple Choice

How would you describe this distribution?

• Left skewed

• Uniform

• Right Skewed

• Symmetrical

Multiple Choice

What is the shape of this bar graph?

• Skew right

• Skew left

• Symmetrical

• uniform

Multiple Choice

Describe the histogram:

• Left Skewed

• Normal/Symmetrical

• Right Skewed

• Uniform/Flat

Multiple Choice

Describe the shape of the graph.

• Skewed right

• Skewed left

• Uniform

• Symmetrical

Multiple Choice

Shape?

• Skewed right

• Skewed left

• Symmetric

• Normal

Multiple Choice

The table shown is comparing a person's foot length to their height in cm. Calculate a line of best fit.

• f(x) = 25.05x + 5.57

• f(x) = 5.57x + 25.05

• f(x) = -5.57x + 25.05

• f(x) = 5.57x - 25.05

Multiple Choice

find line of best fit using calculator through these points (0,0)(1,2) (3,5) (6,7)

• y=65x+7

• y=1.14x+.64

• y=1.5x+64