The population of fish in a pond in relation to the number of years since stocking is depicted on a graph. For the first few years
after the pond is stocked, the population grows slowly. It increases more quickly as the fish reproduce, then it levels off. A
pollutant kills off almost all of the fish 20 years after stocking. The population begins to grow again when the remaining fish
reproduce. Which graph depicts the situation described above?
Population
Time vears
Population
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Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?