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A study of elementary school children, ages 6 to 11 , finds a high positive correlation between shoe size x and score y on a test of reading comprehension. The observed correlation is most likely due to:

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Answer: The observed correlation is most likely due to the effect of a lurking variable, such as age.

Explanation: A lurking variable is a variable that is not included as an explanatory or response variable in the analysis but can affect the interpretation of relationships between variables. A lurking variable can falsely identify a strong relationship between variables or it can hide the true relationship.

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