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In order to determine the effects of a new pill that is supposed to reduce hair loss, a researcher conducts the following experiment: 500 volunteer subjects (300 men and 200 women) all of which suffer some degree of hair loss are selected to participate in the study. The researcher gives to the women the real pill and the men a sugar pill, but only the researcher knows this. The results of the experiment are likely to be invalid mostly because the gender of the patient could be a confounding variable in this experiment. the subjects were volunteers. the subjects did not know if they were getting the real treatment. the treatment group and control group were not the same size. None of the above

In order to determine the effects of a new pill that is supposed to reduce hair loss, a researcher conducts the following experiment: 500 volunteer subjects (300 men and 200 women) all of which suffer some degree of hair loss are selected to participate in the study. The researcher gives to the women the real pill and the men a sugar pill, but only the researcher knows this. The results of the experiment are likely to be invalid mostly because the gender of the patient could be a confounding variable in this experiment. the subjects were volunteers. the subjects did not know if they were getting the real treatment. the treatment group and control group were not the same size. None of the above

College Algebra
College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter9: Counting And Probability
Section9.3: Binomial Probability
Problem 1E: A binomial experiment is UDC in which there are exactly __________ outcome. One outcome is called...
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In order to determine the effects of a new pill that is supposed to reduce hair loss, a researcher conducts the following experiment: 500 volunteer subjects (300 men and 200 women) all of which suffer some degree of hair loss are selected to participate in the study. The researcher gives to the women the real pill and the men a sugar pill, but only the researcher knows this.

The results of the experiment are likely to be invalid mostly because

  • the gender of the patient could be a confounding variable in this experiment.
  • the subjects were volunteers.
  • the subjects did not know if they were getting the real treatment.
  • the treatment group and control group were not the same size.
  • None of the above
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