Which of the following is the best description of a control group in an experiment?
A) The control group and the test groups may have several differences between them.
B) The control group is identical to each test group, except for one variable.
C) There can be more than one difference between the control group and test groups but not several differences;
otherwise, the experiment is invalid.
D) There should be more than one control group in any experiment.
E) The control group is a test group that is chosen at random
B) The control group is identical to each test group, except for one variable.
You might also like to view...
Populations
a. are only limited by one factor at a time. b. increase arithmetically. c. may increase indefinitely. d. are limited by the carrying capacity. e. overcome limiting factors by increasing their biotic potential
Antibodies are classified by size, location, and function, and which one of the following represents the most common type of immunoglobulin?
A) IgM B) IgG C) IgA D) IgD E) MHC
You want to know whether cookies made with unbleached flour taste better than cookies made with bleached flour; which of the following has the strongest experimental design to test this question?
A) Make two batches of cookies, both with bleached flour; one taster tries both types and ranks which type he likes best. B) Make two batches of cookies, one with bleached flour and one with unbleached flour; one taster tries both types and ranks which type he likes best. C) Make two batches of cookies, one with bleached flour and one with unbleached flour; twenty tasters try both types and rank which type they like best. D) Make two batches of cookies, one with bleached flour and one with unbleached flour; twenty tasters try both types without knowing which ones they are eating and rank which type they like best.
Which of the following are ways to control or treat hepatitis B?
A. Heptavax vaccine B. Recombivax vaccine C. Recombinant interferon D. Hepatitis B immune globulin (HBIG) E. All of the choices may be recommended.