1. Welcome to Day 13! September √4, 2009  SWBAT make baller line graphs Bellwork (make a hypothesis and identify the IV and DV)  Problem: Does the number of cars Lil’ Romeo owns affect the number of friends he has?

2. Agenda  Catalyst Review  What is this graphing thing?  How to make a GREAT line graph  PRACTICE!  Exit Ticket

3. Identify the IV and DV -Independent variable – variable you as a scientist change -Dependent variable – the variable you measure -HINT #2: Dependent goes DownY

4. Determine the type of graph Bar Graph – When the independent variable has items that are not sequentially related (Ex. Names, Cities, Sample #s, etc.) Line Graph – When the independent variable has items that are sequentially related (Ex. Distance, Time, Volume, etc.)

5. LINE GRAPHS

6. `  Step one Identify variables IV goes on X axis DV goes on Y axis Water Temp ( o C) Crawfish Speed (m/s) 151.0 201.7 252.0 302.5 352.5 401.9 451.5 501.2 A group of students were trying to figure out if the temperature of the water affected the speed of a crawfish. They set up 8 tanks of water and kept them at different temperatures. They then placed crawfish in each tank and made them swim and measured their speed. Using the data at the left, construct a graph that shows the relationship between water temperature and crawfish speed. What is the IV? What is the DV?

7.  Step 2: Determine type of graph Water Temp ( o C) Crawfish Speed (m/s) 151.0 201.7 252.0 302.5 352.5 401.9 451.5 501.2 A group of students were trying to figure out if the temperature of the water affected the speed of a crawfish. They set up 8 tanks of water and kept them at different temperatures. They then placed crawfish in each tank and made them swim and measured their speed. Using the data at the left, construct a graph that shows the relationship between water temperature and crawfish speed. -Bar Graph – When the independent variable has items that are not sequentially related (Ex. Names, Cities, Sample #s, etc.) -Line Graph – When the independent variable has items that are sequentially related (Ex. Distance, Time, Volume, etc.)

8. STEP 3: Determine the scale for each axis -Find the range of data for each variable -Ex. 0 sec (lowest) to 360 sec (highest) -Find the difference between these numbers (360 sec) -Find out ABOUT how many marks you have on your axis (approx. 10 marks) -Find the value of each mark by dividing the range by the # of marks (360 sec / 10 marks = 36 sec / mark ) (HINT: if your number is awkward, round to a closer number (35 sec / mark)) -Label marks by increasing amount (0 sec, 35 sec, 70 sec, 105 sec, etc.) Water Te mp ( o C) Crawfish Speed (m/s) 151.0 201.7 252.0 302.5 352.5 401.9 451.5 501.2

9. STEP 3: Determine the scale for each axis -Find the range of data for each variable -Find the difference between these numbers -Find out ABOUT how many marks you have on your axis -Find the value of each mark by dividing the range by the # of marks -HINT: if your number is awkward, round to a closer number -Label marks by increasing amount Water Te mp ( o C) Crawfish Speed (m/s) 151.0 201.7 252.0 302.5 352.5 401.9 451.5 501.2

10.  Step 4: Enter Data Plot all of your values Water Temp ( o C) Crawfish Speed (m/s) 151.0 201.7 252.0 302.5 352.5 401.9 451.5 501.2

11. Step 5: Label - Title (Dependent variable vs. Independent variable) -X, and Y labels -Units on the X and Y labels -Increments on the axes

12. Exit Ticket  Which axis does the IV go on? Which axis does the DV go on?