NAME _____________________________________

Barbie Bungee Data Collection Activity           
Supplies needed:	Names & Duties of Group Members: 

1 Barbie	Dropper:	_______________________

Tape measure and scotch tape	Eyeballer:	_______________________

10 Rubber bands	Eyeballer:	_______________________

Graphing calculator (supplied by teacher)	Recorder:	_______________________

Pencil and paper and ruler	Calculator:	all members should work together	
Data Collection
x	Jump #1	Jump #2	Jump #3	y	
Number of Rubber Bands	Distance Bungeed (in inches)	Distance Bungeed (in inches)	Distance Bungeed (in inches)	Average of 3 Jumps (in inches)	

2

3

4

5

6

7
					
8					
9					
10					

Rewrite your x and y-values below from the data.  Then plot the points (x, y) on the graph below.
Points to plot (x, y) 
x 	
Plot the points on the axes below.

Sketch a line that best fits your data.
	To do this, pick TWO points that best represent the data and draw a straight line through these two points.

y 	

		

		

		

1.   Plot the points on the graphing calculator.  ASK AN INSTRUCTOR FOR HELP! 
•	You will need to turn on a stat plot and then put your (x,y) data into List 1 and List 2.  All the x-values will be put into List1.  All the y-values will be put into List 2.  You will also need to set your window so that all the data can be seen.  This can be done by hand or using Zoom Stat key.

2.	Choose two points that best represent the data that you have collected.	  Use the SAME TWO points you used to draw your line on the graph!

	The two points are ( ___, ___ ) and ( ___, ___ ).

3.	Using these two points, find the slope of the line through them.  
	Simplify your answer (a decimal approximation, to the nearest tenth, is fine)	    
		 Recall:    

4.	Using one of the points (from #2) and the slope (from #3) , find an equation for the line using the point slope form of a line.
			Recall:  		where  is the point and m is the slope.

5.	Transform your equation into slope-intercept form.  That is the form:   

6.	Rewrite your equation here:         
   
			 (slope)		(y-intercept)

7.	Using the graphing calculator, graph your equation to see if it is a good fit to your data points.   ASK AN INSTRUCTOR FOR HELP!  You will be entering your equation from  #6 into Y1 on your calculator and then graphing.   If the line seems “off ”, check your work for any mistakes and find the correct equation!
•	Have an instructor check your line!

8.	Use your equation to determine what distance Barbie would fall using 50 rubber bands.  (Take a moment and think -- will 50 be an x-value or a y-value?)

9.	Use your equation to determine how many rubber bands you would need to use to have Barbie plunge to a distance of 150 inches.  (Once again think – is 150 going to be an x-value in your equation or a y-value?)

10.	Barbie wants to bungee off the Eiffel Tower. It is 986 ft tall.  How many rubber bands will you need so Barbie just brushes her hair (hopefully not her head) on the ground?
	Ooh la la!											

11.	A location for a final bungee jump will be specified by your instructor.  Use your equation to determine the number of rubber bands needed to give Barbie the greatest thrill in this bungee jump.  This means she should come as close as possible to the ground WITHOUT hitting her head.  Show your calculations below.  We’ll test your calculations during class in a Barbie Bungee Contest!

Specified by the instructor!

					Barbie will be bungee jumping ___________________
						(watch your units!)