5. Second-grade students are randomly divided into two groups. One group is taug

Question

5. Second-grade students are randomly divided into two groups. One group is taught math using traditional techniques. The other is taught math using a reform method. After I year, each group is given an achievement test to compare its proficiency with that of the other group a) (5) Is this an observational study or an experiment? Explain. b) (2) State the explanatory variable c) (2) State the response variable. (4) Suppose that the experiment showed that the students in the class that was taught using the reform method did better on their achievement tests than students taught the traditional way. Can we infer that the reform method was the cause of the improvement on their test scores? Explain. d)

Explanation / Answer

a) It is an experimental study

b) Method of teaching is explanatoy variables

c) Scores obtained in test is response variable

d) Yes we may infer that reference method is better than traditional method only when there is large diference between average scores obtained from reference method and traditional method. If there is slight difference then it may be due to by chance or due to lurking variables.

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