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Apologia Gen Mod 3

Apologia General Science Module 3 Analyzing & Interpreting Experiments

QuestionAnswer
Experimental variable An aspect of an experiment that changes during the course of the experiment
Control (of an experiment) The variable or part of the experiment to which all others will be compared
Single-blind experiments Experiments in which the participants do not know whether or not they are a part of the control group
Double-blind experiments Experiments in which neither the participants nor the people analyzing the results know who is in the control group
Why can a needle float on water? surface tension
What does soap do to the surface of water? Reduces the surface tension of water
True or False? Saltwater is more dense than pure water. True
surface tension Can be thought of as a thin film that stretches across the surface of every liquid
subjective data the data being collected depends to some extent on the opinions of people
objective data There is no way opinion can affect the experimental results; rather it is based on measurable data.
pain threshold Some people can experience a lot of pain and barely notice it, while others can experience just a little pain and be miserable.
x-axis the horizontal scale on a graph
y-axis the vertical scale on a graph
placeboes fake pills
experimental variable Is good when you are using it to learn something from the experiment. Should be reduced or eliminated when if effects the results of the experiment but you do not learn anything from it.
When is a single-blind experiment used? When the data from the experiment will result in objective data.
When is a double-blind experiment used? When the data from the experiment will result in subjective data.
When is it not necessary to use a single or double-blind experiment? When the subjects being studied are not people, but rather plants for example.
What is the one reason a test might be done as a double-blind experiment even though the data is objective and does not require this type of testing? When the researcher wants to avoid any criticism regarding his honesty in conducting the experiment and reporting the results.
Created by: nmaeser