10 Questions
What is the key difference between dependent variables and controlled variables in an experiment?
Dependent variables are measured based on manipulations, while controlled variables are kept constant.
In a scientific experiment, why is it important to have a representative sample?
To make conclusions about the larger population from the sample.
When interpreting experimental results, what should scientists consider in addition to comparing with hypotheses and predictions?
Alternative explanations for the results
What should scientific questions focus on?
Observable phenomena
Why must a hypothesis be falsifiable?
To enable testing and verification in the real world
What is the purpose of generating predictions from hypotheses?
To provide a basis for testing the hypothesis
What is the role of the independent variable in an experiment?
It is the variable that is manipulated or changed
In the given text, why was it important for scientists to exclude the alternate explanation that diet preference explains observations?
To confirm that the high-toxin plant was directly impacting the number of eggs laid by monarch caterpillars
How does the Harvard Step Test measure a person's cardiovascular fitness?
By recording the person's pulse rate before and after exercise
Why is it important to have at least one person designated to measure pulse rates/timer in the Harvard Step Test experiment?
To ensure accurate data collection and reduce measurement errors
Learn the basics of experimental design, including the role of dependent variables, controlled variables, sampling, replication, and randomization. Understand the importance of representative samples, adequate replication, and random selection in drawing valid conclusions from experiments.
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