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In a study of a new method of teaching arithmetic, claimed to improve on conventional techniques, 400 children were divided at random into two groups A and B, of sizes 250 and 150 respectively. Those in group B were taught using the experimental method, while those in group A were taught by conventional methods. After completion of the course all the pupils were given the same test paper, and the group scores were as follows. Group A mean 67-8, variance 60-4, Group B mean 70-2, variance 55-6. Is there any evidence that method B is effective? State carefully your null hypothesis, alternative hypothesis and conclusion.

In a study of a new method of teaching arithmetic, claimed to improve on conventional techniques, 400 children were divided at random into two groups A and B, of sizes 250 and 150 respectively. Those in group B were taught using the experimental method, while those in group A were taught by conventional methods. After completion of the course all the pupils were given the same test paper, and the group scores were as follows. Group A mean 67-8, variance 60-4, Group B mean 70-2, variance 55-6. Is there any evidence that method B is effective? State carefully your null hypothesis, alternative hypothesis and conclusion.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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In a study of a new method of teaching arithmetic, claimed to improve on conventional techniques, 400 children were divided at random into two groups A and B, of sizes 250 and 150 respectively. Those in group B were taught using the experimental method, while those in group A were taught by conventional methods. After completion of the course all the pupils were given the same test paper, and the group scores were as follows. Group A mean 67-8, variance 60-4, Group B mean 70-2, variance 55-6. Is there any evidence that method B is effective? State carefully your null hypothesis, alternative hypothesis and conclusion.
Transcribed Image Text:In a study of a new method of teaching arithmetic, claimed to improve on conventional techniques, 400 children were divided at random into two groups A and B, of sizes 250 and 150 respectively. Those in group B were taught using the experimental method, while those in group A were taught by conventional methods. After completion of the course all the pupils were given the same test paper, and the group scores were as follows. Group A mean 67-8, variance 60-4, Group B mean 70-2, variance 55-6. Is there any evidence that method B is effective? State carefully your null hypothesis, alternative hypothesis and conclusion.
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