Linear Regression FRI

A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.

• y = 1.5x + 12
• y = 12x + 1.5
• y = 0.67x - 8
• y = -8x + 0.67

Estimate the correlation coefficient for this scatterplot.

• A) r = 1.2

• B) r = 0.89

• C)r = 0

• D) r = -0.89

What is the type of association?

• Negative 
• no association
• positive 

What type of association does this graph have?

• positive
• negative
• none
• all of the above

What type of correlation does this scatterplot display?

• Positive

• Negative

• No Correlation

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

Using your linear regression, what is y when x is 30?

• 61.59
• 52.46
• 57.94
• 59.76

Write the equation for the table given

• y = 1/3x
• y = 3x
• y = 1/2x

What letter do we use to represent correlation coefficient?

• c
• r
• p
• h

A correlation value (r) that has a strong, positive linear association would have a value close to

• 1

• 0

• -1

• Cannot be answered