Graphing

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

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

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

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

Types of Graphs Bar Graph Bar Graph comparisons comparisons Line Graph Line Graph Change overtime Change overtime Pie Graph Pie Graph Percentages or parts of a whole Percentages or parts of a whole

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

The axes should be labeled with the measured quantity and the unit in which it was measured. Use Both!!!

Scales on the axes should be appropriate for the data, spread out as much as possible, and the axis must be divided evenly giving each square the same value.

Title should be in Y-axis vs. X-axis format Density of water vs. Temperature of water

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

Is there a relationship between thumb length and number of wins? Independent Variable? Independent Variable? Thumb length Thumb length Dependent Variable? Dependent Variable? Number of wins Number of wins Thumb Length (mm) Number of Wins

Is there a relationship between thumb length and number of wins? Thumb length (mm) Number of Wins Thumb Length (mm) # of wins # of wins vs. thumb length ** Use this if we are comparing the number of wins