1. An educational software company wants to compare the effectiveness of its com
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Question
1. An educational software company wants to compare the effectiveness of its computer animation for teaching creative writing with that of a textbook presentation. The company tests the creative-writing skills of each of a number of second-year college students and then randomly divides them into two groups. One group uses the animation, and the other studies the text. The company retests all the students and compares the increase in creative-writing skills in the two groups. Is this an experiment? Why or why not? What are the explanatory and response variables?
A) This is an observational study since there is no interference in the student's study. The explanatory variable is the teaching method, and the response variable is the increase in understanding of cell biology.
B) This is an observational study since the students are assigned to two groups where they receive two different kinds of treatments. The explanatory variable is the teaching method, and the response variable is the increase in understanding of cell biology.
C) This is an experiment since each subject is assigned to a certain teaching method. The explanatory variable is the teaching method and the response variable is the increase in understanding of cell biology.
D) This is an experiment since each subject is assigned to a group with a certain treatment. The explanatory variable is the increase in understanding of cell biology and the response variable is the teaching method.
2. Some claim that magnets can be used to reduce pain. You are required to design a double-blind experiment to test this claim. Identify the appropriate double-blind design for the given study?
A) Randomly assign the subjects to be treated with magnets or a placebo. The subjects are informed about the object they are treated with and their responses in terms of pain relief are recorded.
B) Randomly assign the subjects to be treated with magnets or a placebo. The subjects and researcher should be prevented from determining whether the subjects are being treated with a magnet or a placebo and measure their responses in terms of pain relief.
C) Consider only those subjects that want to be treated with a magnet and measure their responses in terms of pain relief.
2. Some claim that magnets can be used to reduce pain. You are required to design a double-blind experiment to test this claim. Identify the appropriate double-blind design for the given study?
A) Randomly assign the subjects to be treated with magnets or a placebo. The subjects are informed about the object they are treated with and their responses in terms of pain relief are recorded.
B) Randomly assign the subjects to be treated with magnets or a placebo. The subjects and researcher should be prevented from determining whether the subjects are being treated with a magnet or a placebo and measure their responses in terms of pain relief.
C) Consider only those subjects that want to be treated with a magnet and measure their responses in terms of pain relief.
Explanation / Answer
1) AS THE TWO GROUPS ARE MADE AND THE WAY THEY HAVE BEEN TREATED DIFFERENTELY WITH DIFFERENT TEACHING STYLE SHOWS THAT IT IS AN EXPERIMENT AS TWO GROUPS WITH TWO TEACHING METHODS
IN THE THE EXPLANATORY VARIABLE IS THE TEACHING METHOD WHICH IS DIFFERENT FOR BOTH THE GROUPS
RESPONSE VARIABLE WILL BE THE CLARITY OF UNDERSTANDING WITH THE TEACHING METHOD
HENCE OPTION C IS CORRECT.
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