A researcher conducted a study to determine the effectiveness of the Collaborative Method, Lecture Method and Computer-Assisted Method in teaching mathematics to 16-year old students in a secondary school. She used a quasi-experimental design for her study and selected sample and divided them into three groups as shown in the table below.
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Group
N
Collaborative Method
35
Lecture Method
35
Computer-Assisted Method
35
At the end of the experiment which lasted for 10 weeks, all subjects were tested on their mathematics performance and the scores were compared.
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Why do you think the researcher selected a quasi-experimental design and not a true design?
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State TWO (2) null hypotheses for the study.
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Discuss FOUR (4) threats to the internal validity of the experiment.
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Explain any TWO (2) techniques that the researcher could use to ensure the three groups are equivalent in ability.
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In order to reject the null hypothesis, it is necessary to analyse the data statistically. Explain.
Part C (10%) – 3 pages
Attitude Toward Recycling of Waste
- Design a FIVE (5) item attitude scale to measure the above. [include it in your answer]
- Briefly describe how you would ensure that the attitude scale measures what it is supposed to measure.
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