AnswersNC-Math 4 CRObservational Studies and Experiments

Observational Studies and Experiments Answers

14 verified answers1 views
1
Free Preview

In an experiment to test the effectiveness of an energy supplement, participants are randomly assigned to groups by using a table of random digits. Which of the following best describes the control group in the experiment?

Question illustration
A
The control group is the group who received protein bars without the energy supplement.
B
The control group is the group who received protein bars with the energy supplement.
C
There is no control group, but one is needed.
D
There is no control group, and none is needed.
2
Free Preview

The subjects in the who received the reported in their headache symptoms during the experiment. This is a possible placebo effect.

A
medication
B
placebo pill
3

The subjects in the who received the reported in their headache symptoms during the experiment. This is a possible placebo effect.

A
no improvement
B
minimal improvement
C
moderate improvement
D
strong improvement
4

In an experiment to test the effectiveness of an energy supplement, participants are randomly assigned to groups by using a table of random digits. Which of the following accurately describes the benefit of comparison in the experiment shown in the design web?

Question illustration
A
The starting energy levels of the subjects can be compared to see who might benefit the most from the protein bars with the energy supplement.
B
The energy levels of the subjects in the treatment group only can be compared to see who might benefit the most from the protein bars with the energy supplement.
C
The energy levels of those in the treatment group and in the control group can be compared to determine if the ingredient had a significant effect.
D
There is no benefit of comparison in the experiment.
5

The subjects in the who received the reported in their headache symptoms during the experiment. This is a possible placebo effect.

A
control group
B
treatment group
6

This experiment is an example of experiment.

A
a double blind
B
a single blind
C
neither a single blind nor a double blind
7

The should not be informed about the different versions of the medication to reduce the influence of .

A
test subjects
B
test administrators
C
treatment group
D
control group
8

The should not be informed about the different versions of the medication to reduce the influence of .

A
administrator bias
B
the placebo effect
C
the blind effect
9

Which of the following represent controls in the experiment? Check all that apply.

A
Ages of the subjects
B
Number of hours of sun exposure
C
Amount of sunscreen applied
D
Intervals of sunscreen application
E
Outside temperature
F
Number of hours spent in the water
10

Which of the following accurately describes the benefit, if any, of control in the experiment?

A
By controlling variables that may influence the response variable, we reduce variability in the response variable.
B
By controlling variables that may influence the response variable, we eliminate variability in the response variable.
C
By controlling variables in the experiment, we eliminate the need to have a control group.
D
There is no benefit of control in the experiment.
11

A college professor conducts an experiment to determine if students perform better on exams when they study alone or in small groups. A total of 150 students taking an introduction to sociology course volunteer to participate in the study. Students are randomly assigned either to study alone for an upcoming exam or are assigned to a study group. The exam grades are then compared. Which of the following accurately describes the benefit of random assignment in the experiment?

A
Students of different abilities are more likely to be evenly distributed, so any differences observed in the exam grades are more likely to be a result of the treatment.
B
Students of different abilities are more likely to be evenly distributed, so any differences observed in the exam grades are guaranteed to be a result of the treatment.
C
Students of different abilities are less likely to be evenly distributed, so any differences observed in the exam grades may or may not be a result of the treatment.
D
There is no benefit of random assignment in the experiment.
12

There are experimental units in each treatment group. There are experimental units in all. The large number of loaves baked for each group allow for good comparison of the differences in shelf life.

A
0.5
B
50
C
150
13

There are experimental units in each treatment group. There are experimental units in all. The large number of loaves baked for each group allow for good comparison of the differences in shelf life.

A
0.5
B
50
C
150
14

There are experimental units in each treatment group. There are experimental units in all. The large number of loaves baked for each group allow for good comparison of the differences in shelf life.

A
will
B
will not
C
does not affect

Did you find these answers helpful?

More from this Course

Instruction
11 verified answers

Instruction

Instruction
5 verified answers

Instruction

Assignment
10 verified answers

Observational Studies and Experiments