An Investigator Conducts an Experiment Involving the Effects of Three

question 92

Multiple Choice

An investigator conducts an experiment involving the effects of three levels of a drug on memory. Subjects are randomly assigned to one of three conditions. A different drug level is administered in each condition. Memory is measured 10 minutes after each subject receives the drug. The following scores are recorded. The higher the score, the better the memory. ΣS_within = _________.

• A) 62.25
• B) 59.75
• C) 56.65
• D) 57.00

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Definitions:

Tertiary Consumer

An organism that typically eats secondary consumers, residing at or near the top of a food chain and usually a carnivore or an omnivore.

Ecological Efficiency

A measure of the energy transfer between different trophic levels in an ecosystem, typically representing how much energy from a lower level is available for use at the next level.

Trophic Level

The position that an organism occupies in a food chain, which is a measure of its feeding level.

Decomposers

Organisms, such as bacteria and fungi, that break down dead organisms and waste materials into simpler substances.