Experimental design Flashcards
What does it mean for an experiment to be reliable and valid?
if a test produces accurate results, they should be reproducible.
How do you write and identify an experimental hypothesis.
1 Ask a question. …
2 Conduct preliminary research. …
3 Define your variables. …
4 Phrase it as an if-then statement. …
5 Collect data to support your hypothesis. …
6 Write with confidence.
independent variable
a variable (often denoted by x ) whose variation does not depend on that of another.
dependent variable
depends on the independent variable
control variable
the left over evidence after the independent and dependent variables.
What group in a experiment receives treatment
The treatment group
What group does not receive any treatment
The control group
What are negative controls
particular samples included in the experiment that are treated the same as all the others but are not expected to change from any variable in the experiment.
what are positive controls
a group in an experiment that receives a treatment with a known result, and therefore should show a particular change during the experiment.
why are positive and negative controls important in an experiment
helping the scientist understand that the experiment was performed properly.
What is a confounding variable?
a third variable in a study examining a potential cause-and-effect relationship.
What effect might a confounding variable have on an experiment?
spurious or distorted associations between two variables.
