A survey shows that children who have encyclopedias in their homes earn better grades in school than children whose homes lack encyclopedias. The researcher concludes that having encyclopedias at home improves grades. This conclusion is erroneous primarily because the researcher has incorrectly failed to allow for experimenter bias Answer A: failed to allow for experimenter bias A identified the independent variable Answer B: identified the independent variable B identified the dependent variable Answer C: identified the dependent variable C inferred correlation from causation Answer D: inferred correlation from causation D inferred causation from correlation

It should be noted that when there's a correlation between two variables, it doesn't mean that the change in one of the variables brought about the change in the other variable.

In this case, the variables are encyclopedias and improved grades. It should be noted that having encyclopedias at home does not necessarily improve one's grades. There may be other factors that helped the students such as extra coaching, etc.

Therefore, in this case, the researcher inferred causation from correlation.

In conclusion, the correct option is D.

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