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Experimental design vocabulary. Two types of data
qualitative and quantitative.
qualitative is the quality.
characteristics like color texture
odor (smell). Quantitative is the measurement.
so, five petals or seven centimeters long.
let's start by
looking at an experiment problem question. How will food coloring
diffuse at different
temperatures of water?
independent variable is the variable that you
purposely change (or sometimes we say it's the
manipulated variable). In that experiment was it
food coloring, rate of diffusion or the temperature of
water? they purposely changed
temperature water! the independent variable
is the temperature water
The levels of the IV: there's a control group
- an unchanged or natural group and then there's an experimental group
so in that experiment room temperature water
was your control (that's your normal your natural)
your experimental group is hot because that is more changed.
A placebo is a control group
where they give one a sugar pill or water pill
and the experimental group is the actual drug to test.
What is the dependent variable?
DV depends on the IV
Or, the variable that changes in response to the IV
say "The DV depends on the IV"
In the experiment, what depended on the temperature of water?
the rate of diffusion depended on the temperature
In an experiment, is the iV the cause or the effect?
The IV is the cause!
What is the relationship between your data
and the dependent variable? they are completely related
your data is your DV
what are constants why do we have constants?
constants are part of an experiment that are kept the same
they keep the experiment fair