Interpreting the Line of Best Fit

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

What type of correlation is when one value is increasing, then the other value is decreasing?

• postive
• negative
• none
• cannot be determined

You are analyzing a scatter plot that has a positive correlation. What is true of the of the x and y values?

• As x increases, y decreases
• As x increases, y increases
• As x decreases, y decreases

Describe the correlation in the graph shown.

• High/Strong Negative
• High/Strong Positive
• Low/Weak Negative
• Low/Weak Positive

What is the type of association?

• Negative 
• No correlation
• Positive 

Which of the following could be a possible line of best fit for the data?

• y = 3x + 0
• y = 0.833x + 490
• y = -2x + 470

What is step #1 for writing a line of best fit in desmos?

• in a new row type y₁ ~ mx₁ + b
• add an item (table)
• enter all data points into the table
• if needed, adjust the window to see all data points

What is step #2 for writing a line of best fit in desmos?

• in a new row type y₁ ~ mx₁ + b
• add an item (table)
• enter all data points into the table
• if needed, adjust the window to see all data points

What is step #3 for writing a line of best fit in desmos?

• in a new row type y₁ ~ mx₁ + b
• add an item (table)
• enter all data points into the table
• if needed, adjust the window to see all data points

What is step #4 for writing a line of best fit in desmos?

• in a new row type y₁ ~ mx₁ + b
• add an item (table)
• enter all data points into the table
• if needed, adjust the window to see all data points