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# Graphing Your Data - PowerPoint PPT Presentation

Graphing Your Data. Showing patterns & trends. A picture is worth a thousand words !. Types of data (information). Variables what you measure in an experiment dependent variable measured variable unpredictable change : we don’t know how it will change until we do the experiment Y-axis

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Presentation Transcript

Showing patterns & trends

A picture is worth a thousand words!

Types of data (information)
• Variables
• what you measure in an experiment
• dependent variable
• measured variable
• unpredictable change: we don’t know how it will change until we do the experiment
• Y-axis
• independent variable
• manipulated variable
• predictable change: it only changes because we chose how it would change
• X-axis

The effect of _____________on _____________

INDEPENDENT

DEPENDENT

Examples of experiments 1
• How does fertilizer affect the growth rate of plants?
• we set up an experiment testing different amounts of fertilizer on different plants & measuring the growth (height) of the plants:
• dependent variable (Y-axis)?
• height of plants
• independent variable (X-axis)?
• amount of fertilizer

The effect of _____________on _____________

Amount of Fertilizer

Height of Plants

Examples of experiments 2
• How does exercise affect heart rate of 10th grade student?
• we set up an experiment testing different lengths of time of exercise (minutes) on the heart rate of students:
• dependent variable (Y-axis)?
• heart rate
• independent variable (X-axis)?
• minutes of exercise

The effect of _____________on _____________

Exercise

Heart Rate

Examples of experiments 3
• What’s the favorite drink of students?
• we set up an experiment surveying students and asking which is their favorite drink :
• dependent variable (Y-axis)?
• number of students
• independent variable (X-axis)?
• type of drink

The effect of _____________on _____________

Type of Drink

How many students chose it

Making pictures out of data

How’s a critterto choose?

• Graphs
• line graphs
• graphing data that shows continuous change
• bar graphs (or histograms)
• graphing data that is in disconnected groups

10

20

30

15

25

0

5

0

1500

1000

2500

2000

500

1200

How does elevation affect temperature?

Line graph!

18

temperature

1200 ft?

elevation

0

2

4

6

1

3

5

water

Pepsi

Coke

tea

Which drink do you like best?

Bar graph!

number of students

Red Bull?

RB

RB

type of drink