Best Line of Fit Part 3

Scatter Plots and Line of Best FIt

​Standard:

MA.8.DP.1.1 Given a set of real-world bivariate numerical data, construct a scatter plot or a line graph as appropriate for the context.

Open Ended

What is your biggest pet peeve? Why?

Multiple Choice

Recall:

The scatter plot gives the number of hours spent studying for a science exam and the final exam grade.

• 55%

• 76%

• 83%

• 94%

Writing an equation for the line of best fit.

Find the y intercept It is your b.

Find the slope. It is your m.

Plug it into y =mx + b

I Do:

• b = 7

• m = -4/7

• y = -4/7x + 7

• Now predict what happens when x = 7, what does y =?

Multiple Choice

We Do:

The graph above shows a line of best fit for data collected on the distance bicyclists have remaining in relation to the amount of time they have been riding.  What is the equation of the line of best fit?

• y = -25x + 170
• y = 25x + 170
• y = -(5/8) x + 170
• y = (5/8) x + 170

Multiple Choice

You Do:

The graph shows a line of best fit for data collected on the price of a unit in relation to the number of units sold.  What is the equation of the line of best fit?

• y = - (1/2) x + 10
• y = - (1/50) x + 40
• y = - (1/2) x + 40
• y = - (1/50) x + 10

Multiple Choice

Exit Ticket:

The graph  shows a line of best fit for the data collected on the amount of cell phone bills in relation to the number of minutes used.  What is the equation of the line of best fit.

• y = (1/2) x + 3
• y = (1/2) x + 15
• y = (1/40) x 
• y = (1/40) x + 15