A school psychologist wants to test the effectiveness of a new method of teaching biology biology. She recruits 500 500 first first-grade students and randomly divides them into two groups. Group 1 is taught by means of the new method, while group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test (graded on a scale from 1-10
A school psychologist wants to test the effectiveness of a new method of teaching
biology
biology. She recruits
500
500
first
first-grade students and randomly divides them into two groups. Group 1 is taught by means of the new method, while group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test (graded on a scale from 1-10) is administered and the results of the two groups are compared. Complete parts (a) through (i) below.
(a) What is the response variable in this experiment?
A.
The scores on the achievement tests of both group 1 and group 2
B.
The students' ability in
biology
biology
C.
The score of group 1 on the achievement test
D.
The score of group 2 on the achievement test
(b) Is the response variable qualitative or quantitative?
A.
The response variable is quantitative because it is a measurement.
B.
The response variable is quantitative because it is a characteristic.
C.
The response variable is qualitative because it is a characteristic.
D.
The response variable is qualitative because it is a measurement.
(c) Which of the following explanatory variables is manipulated?
Method of teaching
Grade level
Teacher
Intelligence
Intelligence
(d) What are the treatments? How many treatments are there?
A.
The treatments are the new teaching method and the traditional teaching method. There are 2 treatments.
B.
The treatments are the students. There are
500
500 treatments.
C.
The treatment is the teacher. There is 1 treatment.
D.
The treatments are group 1 and group 2. There are 2 treatments.
(e) How are the factors that are not controlled dealt with?
A.
Random assignment
B.
The groups are split based on their teacher.
C.
By assigning the first half of the
first
first-grade students to group 2 and the other half to group 1
D.
By assigning the first half of the
first
first-grade students to group 1 and the other half to group 2
(f) Which group serves as the control group?
A.
Group 1 serves as the control group because this group corresponds to the new teaching method that is being tested.
B.
Group 2 serves as the control group because this group corresponds to the new teaching method that is being tested.
C.
Group 1 serves as the control group because this group corresponds to the standard method that will be compared to the other method.
D.
Group 2 serves as the control group because this group corresponds to the standard method that will be compared to the other method.
(g) What type of experimental design is this?
Matched-pairs design
Case-control study
Randomized block design
Completely randomized design
(h) Identify the subjects.
The school district
The
500
500 students
The teachers
All
first
first-grade students in the school district
(i) Draw a diagram to illustrate the design. Choose the correct figure below.
A.
Figure 1
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New
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Tradit.
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Group 2
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Group 1
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Compare
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scores
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Random
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assign.
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students
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treat.
A diagram has a box on the left that reads "Random assignment of students to treat.". Two arrows branch from this box. The top arrow leads to a box labeled "Group 1". The bottom arrow leads to a box labeled "Group 2". The box labeled "Group 1" has an arrow leading to a box labeled "New". The box labeled "Group 2" has an arrow leading to a box labeled "Traditional". The boxes labeled "New" and "Traditional" have arrows leading to a box labeled "Compare scores".
B.
Figure 2
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New
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Tradit.
font size decreased by 2 New
New
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Tradit.
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Group 2
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Group 1
font size decreased by 2 Compare
Compare
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scores
font size decreased by 2 Compare
Compare
font size decreased by 2 scores
scores
font size decreased by 2 Random
Random
font size decreased by 2 assign.
assign.
font size decreased by 2 of
of
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students
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to
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group
A diagram has a box on the left that reads "Random assignment of students to groups". Two arrows branch from this box. The top arrow leads to a box labeled "Group 1". The bottom arrow leads to a box labeled "Group 2". The box labeled "Group 1" has two arrows, one leading to a box labeled "New" and one leading to a box labeled "Traditional". The box labeled "Group 2" has two arrows, one leading to a box labeled "New" and one leading to a
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