1/21 Warm Up: Problem Solving with LOBF

What is a line of best fit 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.8.EE.B.5

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

Tags

CCSS.8.EE.B.5

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x + 170

• y = 25x + 170

• y = 5/8x + 170

Tags

CCSS.8.EE.B.5

The graph shows a line of best fit for data collected on the amount of income earned by lawn companies in relation to the number of yards mowed.  What is the equation of the line of best fit?

• y = (3/2) x
• y = 30x
• y = 30x + 300
• y = (3/2)x + 300

Tags

CCSS.HSF.LE.B.5

The table shows the height of a tree for various years after it was planted. Using the line of best fit, how tall would the tree be 30 years after it was planted?

• 22 feet

• 23 feet

• 36 feet

• 37 feet

Tags

CCSS.HSF.LE.B.5

Which calculator button opens the lists to enter data from a table?

• STAT
• 2ND
• Y=
• CLEAR

What can we determine from the correlation coefficient? 

• Style + Type
• Percentage + Direction
• Strength + Direction
• Strength + Style

Tags

CCSS.HSF-LE.A.1B

r=-0.89

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

Tags

CCSS.HSF-LE.A.1B

A perfect positive correlation has a correlation coefficient of ____. 

• 1
• -1
• 0

Tags

CCSS.HSF-LE.A.1B

What is the y-intercept of the trend line?

• (0, 0)
• (0, 20)
• (0, 100)

Tags

CCSS.HSF.LE.B.5