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Inference on slope

What can we conclude based on the p-value associated with the twins data?

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If there were no association between foster and biological twin IQ (no nature) in the population, we would be extremely unlikely to have collected a sample of data like we did.

A biological twin's IQ being higher causes a foster twin's IQ to be higher.

Biological twins' IQs are higher than foster twins' IQs, on average.

Given the data, the probability of biological and foster twins' IQs being unrelated is close to zero.

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