Carl is conducting a study to determine the effects of the new technology-assisted learning methods among students. As part of this study, he has selected a group of university students, male and female, in the age group of 18 to 24 years. These students have been using the new methods of learning. In terms of research methodology, this group best describes a _____. a. population b. placebo group c. control group d. sample

The group of university students that Carl has selected for his study best describes a sample. So, the correct answer is d. sample.

Here's why:

In research methodology, a sample refers to a subset of individuals from a larger group or population. In this case, the larger population would be all university students in the age group of 18 to 24 years. Carl, however, is not studying all of these students. Instead, he has selected a specific group of these students who have been using the new methods of learning. This specific group of students is, therefore, a sample of the larger population.

A control group (option c) would be a group of students who are not using the new methods of learning, which Carl could compare to the group that is using the new methods. A placebo group (option b) is a term more commonly used in medical or clinical trials, not educational research. And while the students are part of the population (option a) of university students, the term population in research refers to the entire group that you want to draw conclusions about. Since Carl is not studying all university students, but rather a specific group, population is not the best answer.