4. Assume that a population mean equals µ=250, and the population standard deviation is σ=20. Then you compared this population to a sample of n=49 people with a mean of M=205. compute Cohen's d
4. Assume that a population mean equals µ=250, and the population standard deviation is σ=20. Then you compared this population to a sample of n=49 people with a mean of M=205. compute Cohen's d
5. Professor Snape is your instructor for Chemistry 101. He has given the same final exam for his class for a long time; he happens to know that exam scores on this test are
Because of prior laboratory catastrophes (don’t worry, all students were returned to their original species), he tried a new method of instruction this year. He got a random sample of n=16 students and taught them using virtual reality (VR). These students then took his original final exam, and their sample average was M=76.
Assume for this first question that Snape’s final exam has a population standard deviation of σ=12.
Can he demonstrate that the VR instruction method was significantly different from his traditional teaching method? (Assume a two-tailed test with α=.05)
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No, he cannot conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -1.00 and is not significant |
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Yes, he can conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -1.33 and is significant |
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No, he cannot conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -1.33 and is not significant |
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Yes, he can conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -1.00 and is significant |
6. Professor Moriarty is your instructor for Criminal Justice 101. He has also been teaching a long time and always gives the same final exam. He happens to know that his final exam scores are normally distributed and have a population mean of µ=60 with a population standard deviation of σ=8.
Due to receiving poor teaching evaluations, he tried something new. He got a random sample of students and made them watch television legal dramas all semester instead of teaching them.
One group of n=25 students were made to watch 'How to Get Away with Murder' all semester. This sample of students got a mean of M=68 on the final exam.
Can he demonstrate that the TV legal drama method was significantly different from his traditional teaching method? (Assume a two-tailed test with α=.05)
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Yes, he can conclude that his TV legal drama method is significantly different from his traditional method. This is because the z-test equals 5.0 and is significant |
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Yes, he cannot conclude that his TV legal drama method is significantly different from his traditional method. This is because the z-test equals 1.0 and is not significant |
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No, he cannot conclude that his TV legal drama method is significantly different from his traditional method. This is because the z-test equals 5.0 and is not significant |
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Yes, he can conclude that his TV legal drama method is significantly different from his traditional method. This is because the z-test equals 1.0 and is significant |
7. Assume that a population mean equals µ=30, and the population standard deviation is σ=8.
Then you compared this population to a sample of n=36 people with a mean of M=34. compute Cohen's d
8. Professor Snape is your instructor for Chemistry 101. He has given the same final exam for his class for a long time; he happens to know that exam scores on this test are normally distributed and have a population mean of µ=80.
Because of prior laboratory catastrophes (don’t worry, all students were returned to their original species), he tried a new method of instruction this year. He got a random sample of n=16 students and taught them using virtual reality. These students then took his original final exam, and their sample average was M=76.
Assume for this third question that Snape’s final exam has a population standard deviation of σ=2.
Can he demonstrate that the virtual reality instruction method was significantly different from his traditional teaching method? (Assume a two-tailed test with α=.05)
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Yes, he can conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -4.00 and is significant |
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Yes, he can conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -8.00 and is significant |
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No, he cannot conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -4.00 and is not significant |
||
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No, he cannot conclude that his VR method is significantly different from his traditional method. This is because the z-test equals -8.00 and is not significant |
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