P3 - Graphs Prologue September 8, 2011 Sanders

P2 - Observations and Inferences Hypothesis Hypothesis is the suggested relationship between two variables. If, Then, Because format. “If a plant gets water Then it will grow Because water is part of photosynthesis.” * P2 - Observations and Inferences

P2 - Observations and Inferences Variables Experiments test hypotheses under controlled conditions. Variables Independent: variable that’s being tested. Dependant: variable that gets changed as the result of the experiment. Control Variable is not tested but observed. * P2 - Observations and Inferences

P2 - Observations and Inferences Graphs There are three types of graphs Pie Bar Line * P2 - Observations and Inferences

Pie Graph Pie graphs indicate percentages as part of the whole.

Bar Graphs Bar graphs illustrate trends.

Line Graphs Line graphs illustrate data that are in a data table. Often times the data are scattered points.

P2 - Observations and Inferences Direct As one variable increases, the other variable increases Example: As the amount of sunlight Increases plant growth increases * P2 - Observations and Inferences

P2 - Observations and Inferences Inverse As one variable increases, the other variable decreases. Example: As the day progresses, the pencil gets shorter * P2 - Observations and Inferences

P2 - Observations and Inferences Constant As one variable increases, the other variable stays the same Example: As the mass increases, the density of iron stays the same. * P2 - Observations and Inferences

P2 - Observations and Inferences Cyclic As one variable increases, the other variable increases and decreases in a repeated pattern. Example: As the year passes, the temperature rises and falls. * P2 - Observations and Inferences