Regression Equations

What is the y-intercept in the following equation:  y= -5 - 4x

• -4
• -4x
• 5
• -5

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

What is the slope in the following equation:  y=6 - 2/3x

• 2/3
• 6
• -6
• -2/3

What does the slope represent in this situation?

• The sloth runs 1 feet in 3 minutes
• The sloth runs 3 feet in 1 minute
• The sloth runs fast
• The sloth runs 6 feet in 1 minute

What does "b" represent in y=a + bx?

• y-intercept
• slope
• macaroni
• nothing

When evaluating data on a scatter plot, what can be used to make predictions about the future?

• interpoation
• extrapolation
• correlation coefficient
• causation

Tags

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

CCSS.HSS.ID.C.8

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.HSA.CED.A.2

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

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.HSA.CED.A.2

CCSS.HSS.ID.C.7

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

What is least-squares line used for?

• To make predictions
• To make the graph look pretty
• To connect the points
• To make it look like you know what you are doing

Tags

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

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.HSF.IF.B.4

CCSS.HSF.IF.C.7

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7