Graphing and Analyzing Data Independent vs Dependent n

Graphing and Analyzing Data

Independent vs. Dependent n n n In an experiment, the variable that YOU change is the Independent Variable The variable that you measure is the Dependent variable EX: We are going to grow bean plants over the next few weeks.

Quantitative vs. Qualitative Quantitative – something you observe or measure using numbers – n EX: he is 6 ft tall n Qualitative – something you observe or measure using descriptions only – n Ex: he is tall n

Data Tables Independent Variable Time Distance (seconds) (meters) Dependent Variable 5 10 Straight lines drawn with a ruler Units

Or like this…. Independent Variable Time (seconds) Units Distance (meters) Dependent Variable Straight lines drawn with a ruler 5 10

Types of Graphs n Bar Graph n n Line Graph n n Qualitative vs. Quantitative Circle Graph n Percentages

When to use… n n Bar graphs n Used to show data that are not continuous. n Allows us to compare data like amounts or frequency or categories n Allow us to make generalizations about the data n Help us see differences in data Line Graphs n n For continuous data useful for showing trends over time

Rules for Graphing n n n You MUST use graph paper and a ruler!!! The independent variable is on the X-axis The dependent variable is on the y-axis n DRY MIX DRY – Dependent, Responding, Y-axis n MIX – Manipulated, Independent, X-axis n

Graphs How to set up successful graphs!

How to set up your graph!

How to set up your graph! Y Axis (This is for your dependent variable)

How to set up your graph! X Axis (This is for your independent variable)

TAILS Teachers’s Favorite Singer T – Title • Should state the independent and dependent variables

TAILS Teachers’s Favorite Singer T - Title A – Axis Y Axis = Dependent Variable X Axis = Independent Variable • Identify correct axis for variables

TAILS Teachers’s Favorite Singer Decide on an appropriate scale for each axis. T - Title Choose a scale that lets you make the graph as large as possible for your paper and data A – Axis S – Scale

How to determine scale n Favorite Singer Number of Teachers Toby Keith 22 Madonna 15 Elvis 11 Sting 5 Sinatra 2 n n Scale your graph to take up a majority of your graphing area Scale is determined by your highest & lowest number. Scale would be from 2 – 22.

TAILS Teachers’s Favorite Singer 25 20 15 10 5 T – Title A – Axis I – Interval 0 S – Scale

How to determine Intervals Favorite Singer Number of Teachers Toby Keith 22 Madonna 15 Elvis 11 Sting 5 Sinatra 2 n n n The interval is decided by your scale. In this case your scale would be from 2 – 22 and you want the scale to fit the graph. The best interval would be to go by 5’s.

TAILS Teachers’s Favorite Singer The amount of space between one number and the next or one type of data and the next on the graph. The interval is just as important as the scale T – Title A – Axis I – Interval Choose an interval that lets you make the graph as large as possible for your paper and data S – Scale

TAILS Teachers’s Favorite Singer T – Title Number of Teachers 25 20 A – Axis 15 10 I – Interval 5 0 Sinatra Sting Elvis Madonna Toby Keith LABEL your bars. Singers or data points Label Giveyour the bars Y Axis. a general What do label. those What numbers do those words mean? L – Labels S – Scale

TAILS Teachers’s Favorite Singer L – Labels Number of Teachers 25 20 15 • Label the variables on correct axis • Include correct units 10 5 0 Sinatra Sting Elvis Madonna Toby Keith LABEL your bars. Singers or data points Label Giveyour the bars Y Axis. a general What do label. those What numbers do those words mean?

TAILS n. T itle n A xis n I ntervals n L abels n S cale