Identifying Variablesand

Interpreting Graphs

KINDS OF VARIABLES

KINDS OF VARIABLES

Remember!Your hypothesis can TELL you what

your variables are!

Ex. If I drink Mountain Dew before bed, then I will not sleep very much.

IV: Drinking Mountain Dew

DV: the amount of sleep

PracticeUse this hypothesis to identify the

variables:

If I leave all the lights on all day,

then my electric bill will be expensive

IV: __Leaving Lights on or off____

DV: ___Amount of electric bill_____

If I brush my cat more, then there will be less fur on my furniture

IV: Amount of time brushing the cat

DV: Amount of fur on furniture

GRAPHING SKILLS

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8

LINE GRAPH

What can time be measured in???

Seconds - Minutes - Hours – Days - Weeks -

Months – Years - Decades - Centuries - etc.

WHEN TO USE A LINE GRAPH?

Would we use a line graph in the following situations:

•To show how many people like pizza in

this class? NO

•To show how many people live in Meridian,

Idaho? NO

•To show how much it rained each month

this year? YES- because months and years deal with time.

BIRTHDAYS?

• Our birthday does deal with timedoesn’t it? (months/years)

• But, our birthday is constant, meaning it never changes.

• A line graph shows change in time, so we would not use it for this type of graph.

◼ Would we use a line graph to show when our birthdays are?

HOW DO WE MAKE A LINE OR BAR GRAPH?

• A graph ALWAYS has a title!

• A graph has TWO different axis’s

• An axis is either the horizontal line (called x) or the vertical line (called y) that form the base lines of a graph.

Y

X

X-AXIS AND Y-AXIS

INTERVALS• When we are setting up a line graph, we need to

decide what intervals we want to use.

• If we are graphing the temperature for a year, do we want to put 365 days on the graph, and 100 different temperatures?

• When we see a horizontal flat line, that means that there was no change during a specific time period.

Title: _____________________

X Axis

Independent Variable

Y Axis

Dependent

Variable

1 2 3 4 5 6

13

12

11

10

9

8

7

6

5

4

2

1

Intervals

Labeling

Lab

elin

g

Data

PLOTTING A LINE OR BAR GRAPH

Time in minutes

BAR GRAPH

Title: _____________________

X Axis

Y Axis

1 2 3 5 7

13

12

11

10

9

8

7

6

5

4

2

1Intervals

Labeling

Lab

elin

g

Data

Time (Days)X axis - Dependent

Plant Height (cm)Y axis - Independent

0 1.43

7 2.16

14 2.67

21 3.25

28 4.04

35 4.67

Graph the following information. Which type of graph will you use?

Be sure to have a title, proper labeling, accurate data, and appropriate

intervals.

Student Name Shoe Size

Scott 10.5

Audrey 6

Levi 14

Lindsey 8

Butch 9

Alexis 5.5

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23

Graph the following information. Which type of graph will you use?

Be sure to have a title, proper labeling, accurate data, and appropriate

intervals.

0

2

4

6

8

10

12

14

Shoe Size

Scott Audrey Levi Lindsay Butch Alexis

Students

Shoe Comparison

EXTRA VARIABLE PRACTICE

https://www.youtube.com/watch?v=l0jTMDtX4WY