If you use a comparison group when you are collecting evidence, how does that affect the validity of your evidence? A. A comparison group generally makes your evidence less valid. B. A comparison group generally makes your evidence more valid. C. A comparison group generally has no effect on the validity of your evidence.

Which of these is an example of a reliable source of scientific information?
A. a TV sports reporter
B. an article in a magazine about fashion
C. a recognized expert in a field of science
D. a table of nutritional data on the side of a product's package

Suppose you were studying the diet of mice. If you decided to change your experiment from studying the effects of corn in the diet of the mice to studying the effects of wheat, how would that affect the validity of the evidence you collect?
A. The evidence would be less valid.
B. The evidence would be more valid.
C. The validity of the evidence would not change.

You should think critically about scientific evidence supporting product claims because .
A. there is no comparison group
B. the product has been evaluated by a reliable source
C. the information may be distorted in order to sell more
D. there could be another product that is a better value for the money

Suppose an experiment compares two groups that are very different from one another. How does this affect the validity of the evidence collected in that experiment?
A. The evidence would be less valid.
B. The evidence would be more valid.
C. The validity of the evidence would not change.