2. Modeling data
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What’s a constant?
a variable that doesn’t change for the rest of the experiment.
What’s a variable?
something that changes
What’s an independent variable?
-a variable that you change or control in an experiment or study. -It is the cause or input. -Usually plotted on the x-axis
What’s a dependent variable?
-variable depends on the independent variable. -It is the effect or output that you measure. -Usually plotted on the y-axis -we don’t know the value before the experiment.
What’s interpolation?
Predicting data that is inside the range of data (between 2 existing data points)
What’s extrapolation?
Predicting values that are outside the range of data.
What’s a positive correlation?
-IV increases, DV increases, or as IV decreases, DV decreases. -Positive trend on a graph -As one variable increases, so does the other.
What’s a negative correlation?
-IV increases, DV decreases, or as IV decreases, DV increases. -Negative trend on a graph -As one variable increases, the other decreases.
What’s a linear relationship? What does it look like?
A relationship between two variables that, when graphed, makes a straight line. -y=mx+b
What’s the difference between proportional and non-proportional linear graphs?
Proportional is straight and the line passes through the origin (0,0). Non-proportional is straight but doesn’t pass through the origin.
What’s a nonlinear graph?
any graph that doesn’t use a straight line
What’s an inverse relationship?
-Type of negative correlation where y is proportionate to 1/x. -Iv increases, Dv decreases.
What does no correlation mean?
As one variable increases, you cannot tell what the other is doing. Just a graph of scattered points with no trend or line.
What do we need to know when writing equations?
-The slope: y2-y1/x2-x1 -Y-intercept: (usually the last number of equation)
What’s an oscillation?
when an object swings back and forth.
What’s a hypothesis?
An educated guess before the experiment starts.
What’s amplitude?
The height of a wave from its resting position to the highest point.
What’s the scientific method in order?
• Identify research question • Develop a hypothesis • Identify variables • Conduct an experiment • Analyze data • Develop a conclusion