Answer: SAMPLE.
Explanation: He obviously cannot study every 12th grader, so instead he will select a smaller SAMPLE of seniors to study.
Sample in research methodology is defined as a subset of a population selected for measurement, observation or questioning, to provide statistical information about the population. A sample is referred to as an unbiased estimator of a population.
Your answer is most likely C. :) Glad I could help!!
Answer: The radiation of the Sun's electromagnetic waves.
Explanation: The Earth's surface radiates energy back into the atmosphere. Then Gases in the atmosphere radiate heat back to the surface..:)
The answer is 12
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