Dr. ellison finds a relation between amount of sleep and problem solving. specifically, having a higher amount of sleep the night before an exam is associated with higher scores on two measures of problem solving. this is an example of which type of association?

positive association

Explanation:

Positive association refers to the relationship developed between the two variables where the variables tend to move in the same direction. The condition specifies that with the decrease in one variable, the other variable decreases. On the other hand, when one variable increases, the other too increases. According to the given question, Dr. Ellison's research and study sets an example to be a positive association.

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.