Graphing Practice 1 Graphs Independent and Dependent Dependent

Independent and Dependent • Dependent variable is what you have measured – It changes

Where do they go on a graph? • The x-axis of a • The

Titles • Always give your graph a title in the following form: "The dependence

In our example… • The Number of Tadpoles were measured at different p. H

Lines vs bars vs pies • Line graphs are used to track changes over

Pine Cone Lab • Pie Graph was used • The Bar graph was to

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Graphing Practice 1

Graphs

Independent and Dependent • Dependent variable is what you have measured – It changes based on the conditions set by the independent variable • Independent variable is the conditions in the experiment that may or may not cause a change – Think of this as the environment

Where do they go on a graph? • The x-axis of a • The y-axis is the graph is always your dependent variable independent • Number of tadpoles, variable piles of poo, bird • p. H, time, distance… counts… On a line graph, always graph measurable changes in the environment (Y) over the feature of the environment you are manipulating (X)

Titles • Always give your graph a title in the following form: "The dependence of (your dependent variable) on (your independent variable). • Let's say that you're doing a graph where you're studying the effect of temperature on the speed of a reaction. – In this reaction, you're changing the temperature to known values, so the temperature is your independent variable. – Because you don't know the speed of the reaction and speed depends on the temperature, the speed of the reaction is your dependent variable. – As a result, the title of your graph will be "The dependence of reaction rate on temperature", or something like that.

In our example… • The Number of Tadpoles were measured at different p. H levels. So • The number of tadpoles is dependent on the ph=dependent variable • The p. H was changed, that’s environment, so its independent The dependence of tadpole survival on p. H of the water. The effects of p. H on tadpole survival.

Lines vs bars vs pies • Line graphs are used to track changes over time. • Line graphs can also be used to compare changes over the same period of time for more than one group. • Pie charts are best to use when you are trying to compare parts of a whole. • They do not show changes over time. • Data must equal 100% • Bar graphs are used to compare things between different groups (or to track changes over time. ) • Often uses data that has been mathematically altered (% of the group)

Pine Cone Lab • Pie Graph was used • The Bar graph was to illustrate the used to illustrate the distribution of different differences between kinds of organisms niche within a within the whole community “The distribution of “Niche differences within organisms within a a pine cone community”