You want to find out if psychology students have a higher IQ than all university students. The results of the University students show an IQ score of 120. Psychology students' IQ is found to be 125. The results show that the mean of Psychology students is higher than that of all University students. However, we cannot conclude that psychology students have a higher IQ. Why is this the case?

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Answer

We need to consider the possibility of a measurement error.

Answer

We need to conduct a z-test first.

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There is a problem with the sampling distribution.

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We need to check the z-distribution to determine significance.

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