Answer:
The amount of time spent with friends is a third-variable problem.
Explanation:
Third variable problem is a term that describes a type of mix up or confused conclusion where by, third variable leads to a confound causal relationship between two other variables.
In this case, June found that social media use is actually not associated with the feeling of loneliness, because the third variable is actually the cause or have the direct relationship to the feeling of loneliness.
Vignette would be a suitable answer.
The escalator was important because during the 1890’s the huge buildings with 20 floors was incredibly difficult for people to walk up on on a daily basis so it was important that they found a solution to that problem
