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?

Agenda

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

Identify the IV and DV- Independent variable – variable

you as a scientist change- Dependent variable – the variable

you measure - HINT #2: Dependent goes DownY

Determine the type of graphBar 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.)

LINE GRAPHS

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Step one Identify variables IV goes on X axis

DV goes on Y axis

Water Temp (oC)

Crawfish Speed (m/s)

15 1.0

20 1.7

25 2.0

30 2.5

35 2.5

40 1.9

45 1.5

50 1.2

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?

Step 2: Determine type of graphWater Temp (oC)

Crawfish Speed (m/s)

15 1.0

20 1.7

25 2.0

30 2.5

35 2.5

40 1.9

45 1.5

50 1.2

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.)

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 (oC)

Crawfish Speed (m/s)

15 1.0

20 1.7

25 2.0

30 2.5

35 2.5

40 1.9

45 1.5

50 1.2

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 (oC)

Crawfish Speed (m/s)

15 1.0

20 1.7

25 2.0

30 2.5

35 2.5

40 1.9

45 1.5

50 1.2

Step 4: Enter Data Plot all of your values

Water Temp (oC)

Crawfish Speed (m/s)

15 1.0

20 1.7

25 2.0

30 2.5

35 2.5

40 1.9

45 1.5

50 1.2

Step 5: Label- Title (Dependent variable vs.

Independent variable)- X, and Y labels- Units on the X and Y labels- Increments on the axes

Exit Ticket

Which axis does the IV go on? Which axis does the DV go on?