Regression Equations

What is the line of best fit? (Ignore the x = 30, y = ? point.)

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

Tags

CCSS.8.EE.B.5

Find the equation of the line of best fit for the given data

• y = 4.19 + 163.41x
• y = 4.19 - 163.41x
• y =163.41 - 4.19x
• y = -163.41+ 4.19x
  

Tags

CCSS.8.EE.C.8C

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

• f(x) = 5.57 + 25.05x
• f(x) = 25.05 + 5.57x
• f(x) = 25.05 - 5.57x
• f(x) = - 25.05 + 5.57x

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the least-squares line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters
• 15 chapters
• 18 chapters
• 21 chapters

Tags

CCSS.8.EE.C.8C

How much does it cost to have your lawn mowed for 2 hours?

• $16
• $17
• $18
• $19

Tags

CCSS.HSF.LE.B.5

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

Tags

CCSS.HSF.IF.B.4

What type of association does this graph have?

• positive
• negative
• none
• all of the above

Tags

CCSS.HSF-LE.A.1B

r=0.3

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

Tags

CCSS.HSF-LE.A.1B

r=-0.89

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

Tags

CCSS.HSF-LE.A.1B

Estimate the correlation coefficient for this scatterplot. 

• r = -0.9
• r = 1
• r = 0.9
• r = -1