FAQ: Data Types and Quality - Validity

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This community-built FAQ covers the “Validity” exercise from the lesson “Data Types and Quality”.

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[olditalics]

For the Validity Quiz question asking which variables would be relevant for “You want to know if trees near highways are taller than trees in cities,” would the species not also be relevant in this case? Since the species of tree would certainly affect the height and could provide more insight. For example, one would not be able to conclusively state that trees happen to grow larger in one area or the other if the same species was not growing in both. Whereas, if both species and type of location were listed and there were a specific species growing in both areas, the average height of that species could be compared between the two locations, and this would in turn solidify the hypothesis.

[robhenry3]

I agree with olditalics statement and come here for further clarification. If the forest we are in is growing redwoods and in the city we can only find Oaks then by looking at the data you would make the assumption that trees grow taller in the forest, but that would not answer the question that we were asking.