Chapter 4 - AP Statistics MC Practice Test

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c. A census is defined to be measuring all individuals in the population.

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e. Ignore numbers that are larger than 816 or are duplicate numbers.

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d. In order to infer cause and effect, we must run a well-designed experiment. This was an

observational study.

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Answer explanation

c. This is the definition of a simple random sample.

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d. By randomly assigning treatments we are attempting to make the treatment groups be as similar as possible so that we can prevent confounding.

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Answer explanation

d. Because there was no random assignment so we cannot draw conclusions about cause and effect.

However, because there was random selection of people from Canada, the results can be generalized to people from Canada.

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e. Systematic random sampling occurs when a sample is selected from an ordered arrangement of the population where we select one of the first k individuals and choose every k^th individual thereafter.

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d. Bias in the responses means that you are getting responses that are systematically different from the truth.

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d. This is a completely randomized design because you randomly assign subjects to one of the four groups. There are two factors: length of ad (30 seconds or 60 seconds) and number of repetitions (1 time or 3 times).

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e. “Statistically significant” means that the difference in physical activity for the two groups is larger than the difference that could be expected to happen by chance alone.

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