AnswersStatistics and ProbabilitySampling and Experimentation

Sampling and Experimentation — Test Answers

25 verified answers
21
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Which component is missing from the biologist’s process?

A
The biologist did not randomly choose the weather on the night for bat capture.
B
The biologist did not randomly assign the individual bats to the treatment groups.
C
The biologist did not use the appropriate number of treatment groups.
D
The biologist did not use proper labeling on the pieces of paper.
22
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The characteristics of the treatment and control groups

A
might not be roughly equivalent because the students were not labeled and randomly chosen for each group.
B
might not be roughly equivalent because the students could have vastly different views about graphic novels.
C
should be roughly equivalent because the students are from a randomly chosen class.
D
should be roughly equivalent because both groups have a mixture of students with different current grades.
23

Which of the following describes a random block design for this experiment?

A
The plants are paired together based on similar size and numbered 1 and 2. Within each pair, a 6-sided number cube is rolled. If it lands on 1, 2, or 3, plant 1 receives the fertilizer and plant 2 does not receive fertilizer. If the cube lands on 4, 5, or 6, plant 1 does not receive fertilizer and plant 2 receives fertilizer. This is done for each of the 45 pairs of plants.
B
The plants are grouped based on variety. There are 30 plants of each variety. The plants within each variety are numbered 1–30, and the numbers are put in a random number generator. The first 15 unique numbers represent the plants in each variety that will receive fertilizer and the remaining 15 numbers will represent the plants in each variety that will not receive fertilizer.
C
The plants are grouped based on size. The 30 biggest plants are placed in one group and the 30 smallest plants in another other group. The remaining 30 plants are placed in a third group. For each group, a coin is flipped. If the coin lands on heads then the group will receive the fertilizer. If it lands on tails, then the group will not receive fertilizer. Repeat this procedure for the other two groups.
D
The plants are numbered 01–90. Using a line from a random number table, the first 45 two-digit numbers, ignoring repeats and the numbers 91–99 and 00, represent the plants that will receive fertilizer. The remaining 45 plants will not receive fertilizer.
24

Which method describes an experiment?

A
Method A is an experiment because the students choose their own font.
B
Method B is an experiment because the students are randomly assigned a font.
C
Neither method describes an experiment because a third font should be included for comparison.
D
Both methods describe experiments because both fonts are used on the assignment.
25

Which of the following statements is true about the benefits of random assignment?

A
The variability between each subject may not be evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups may or may not be due to the new cream.
B
The variability between each subject would be evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups are more likely due to the new cream.
C
The variability between each type of cream would be evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups are guaranteed to be due to the subjects.
D
The variability between each subject may not be evenly distributed between the two groups, so any observed differences in the level of irritation between the two groups would not be due to the new cream.

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