Please identify the type of study described below: At the beginning of the semester, a researcher identifies two groups of colle
ge students in a mathematics class: a group who regularly drinks more than 5 alcoholic drinks at one time and a group who never drinks more than 5 alcoholic drinks at one time. She then measures their school performance on the final exam. What type of study is this?
A cohort study is a type of longitudinal study (a study where repeated observations are taken in a period of time) where the sample consists of people who share a common characteristic.
In this example, the researcher identifies <u>two groups of COLLEGE students in a MATH class.</u> The group who drinks more than 5 alcoholic drinks at one time and the group who doesn't. We can see that both these groups share the characteristic of being math college students (therefore we can conclude that they share some interest and they were most likely born around the same years). Then, <u>after one semester the researcher measures their performance in their final exam</u> (thus this is a longitudinal study, were the observations were made over the course of one semester).
Since it's a longitudinal study and the sample shares some common characteristics (math college students) we can conclude that this is an example of <u>cohort study. </u>
Biological equilibrium, applied to an ecosystem, denotes the state in which the organisms. are in balance with the habitat-type and with each other. Natural Biological Equilibrium is the. state of equilibrium resulting from "natural" processes, i.e., entirely random processes, and is. Is found among Producers, consumers and decomposers.
The so-called bioeconomic equilibrium is reached when net profit is zero, i.e. when the return from fishing is the same as could be achieved from switching to some other form of economic activity.The existence of a bionomic equilibrium(means both biological and economic equilibrium) is discussed in detail and is then illustrated in both numerical and graphical ways. Actually the bionomic equilibria are the points of intersection of the zero profit line with the biological equilibrium line.
