Final answer:
The term for an apparent relation between two concepts influenced by a third concept is spuriousness.
Step-by-step explanation:
When an apparent relation between two concepts is actually the result of some third concept influencing both of them, this is known as spuriousness. This concept describes a situation where two variables may appear to be linked, but the correlation is actually caused by a third, unseen variable. For instance, an increase in ice cream sales and burglaries may occur simultaneously, leading one to mistakenly think there's a direct relationship between the two. However, the actual cause for both could be the warmer weather, which is the third variable affecting both variables.