A researcher finds that children who eat a more nutritious breakfast tend to have better grades than children who have a breakfast low in nutrition. However, the researcher suspects that education level of parents is probably responsible for this relationship: Better-educated parents may encourage their children to eat better food and work harder in school compared to parents with less education. If the researcher is correct, this is an example of the .

Parent's education level is the Lurking Variable

Explanation:

Variables relationship are a crucial part of the research. Independent variable(s) are the variable(s), which determine the change in level of Dependent Variable. Dependent Variable is the variable, which is being effected by Independent Variable(s). Lurking Variable is a variable, which effects both independent & dependent variables, causes a spurious relationship between them.

Given Research Study : 'Affect of nutritious meal (breakfast) on grade level'. Nutritious value of breakfast is the Independent variable, affecting grade. And, the resultantly determined Grade Level is the Dependent Variable. Parent's education level effects both dependent variable (children's grade level) & independent variable (breakfast nutrition). So, Parent's education Level is the Lurking Variable.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

answer; taking detailed notes during the interview;