Observational Studies and Experiments

Question 1

Is this a completely randomized design? Explain.

Revolt · Accepted Answer

Yes, she assigned the samples of water to the treatments completely at random.

Question 2

Which statements are true? Check all that apply.

Revolt · Accepted Answer

The teacher should block by student ability level—advanced or on-level.; The students should be given homework, or not be given homework, separately within each block.; The size of each block depends on the number of advanced and on-level students.

Question 3

In order to isolate the effect of fuel type on fuel economy, what should the researcher use as pairs?

Revolt · Accepted Answer

vehicles of similar sizes

Question 4

Which of the following statements are always true about matched pairs experimental designs? Check all three that apply.The randomization is carried out separately within each pair.The experimental units should be assigned to the treatments completely at random.Matched pairs design is a form of blocking, with each block containing two experimental units.Half of the experimental units should receive one treatment, and the other half should receive the other treatment.The units must have a physical pair.The randomization within a matched pairs design can be accomplished with a coin toss.

Revolt · Accepted Answer

The randomization is carried out separately within each pair.; Matched pairs design is a form of blocking, with each block containing two experimental units.; The randomization within a matched pairs design can be accomplished with a coin toss.

Question 5

Which matched pairs design is appropriate, if any? Why?

Revolt · Accepted Answer

Design I is appropriate because the second design would confound fatigue with the effect of music.

Observational Studies and Experiments Answers

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