StatTutor Lesson - Cautions about Experimentation

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      Question 1

      12

      Question 1.

      In addition to hidden bias, placebo effect and lack of realism, could there be other problems in experiments?

      A.
      B.

      Correct. Factors that the researcher cannot control such as bad weather, drop outs, death of animals, etc., can create problems in experiments.
      Incorrect. Factors that the researcher cannot control such as bad weather, drop outs, death of animals, etc., can create problems in experiments.
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      Questions 2-3

      97

      Question 2.

      What is a solution to remove this hidden bias?

      A.
      B.
      C.

      Correct. Treating all cows the same will remove the hidden bias. Further, all cows need ear tags so that all cows are treated the same. Spraying with insecticide will just add another bias.
      Incorrect. Treating all cows the same will remove the hidden bias. Further, all cows need ear tags so that all cows are treated the same. Spraying with insecticide will just add another bias.
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      Questions 4-5

      143

      Question 4.

      What problem is reduced when the doctor does not know who received the placebo and who received the active treatment?

      A.
      B.
      C.

      Correct. Doctors diagnosing the response may be influenced by knowing which subject receives the placebo and which subject received the active treatment. This may bias their diagnosis.
      Incorrect. Doctors diagnosing the response may be influenced by knowing which subject receives the placebo and which subject received the active treatment. This may bias their diagnosis.
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      Question 6

      182

      Question 6.

      In double blind, the subjects do not know which treatment they receive. Who else is blinded in a “double-blind” study?

      A.
      B.
      C.

      Correct. Both the researcher and the statistician need to know which treatment each subject receives, but the doctor or nurse may be biased by knowing which treatment each subject receives.
      Incorrect. Both the researcher and the statistician need to know which treatment each subject receives, but the doctor or nurse may be biased by knowing which treatment each subject receives.
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      Questions 7-8

      257

      Question 7.

      What is meant by lack of realism?

      A.
      B.
      C.
      D.

      Correct. All of these may result in lack of realism.
      Incorrect. All of these may result in lack of realism.
      2
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      Questions 9-10

      288

      Question 9.

      True or false: Realism can always be achieved in an experiment.

      A.
      B.

      Correct. Due to ethical reasons, realism may not be possible.
      Incorrect. Due to ethical reasons, realism may not be possible.
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