Trinity and her colleagues conduct an experiment on two groups of people to establish a relationship between caffeine intake and sleep. The participants in the first group consume five cups of coffee per day for a month, whereas the participants in the second group limit their coffee intake to two cups per day for a month. After a month, the participants in the first group report increased sleeplessness. In the context of social psychology, the dependent variable in this experiment is

Atreatment for stuttering in which the person is asked to speak in a singsong fashion, usually with the aid of a metronome is

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a study of twenty 4th grade classrooms in which researchers ask the schools to systematically vary the time of day reading is taught, and collect weekly assessments of reading comprehension for each child over a three-month period.the collection of data, by a playground designer hired by the superintendent of schools, about the physical dimensions of school playgrounds, presence of fencing, and the kinds of equipment currently provided.a feasibility study for implementing a year-round school program, focusing on economic issues such a facilities utilization and transportation costs.an analysis of aggregate data comparing statewide high school graduation rates provided by the state department of public instruction, using county tax information.

Carbon tetrachloride is a toxic liquid. a carbon tetrachloride molecule has one atom of carbon and four atoms of chlorine. what is its chemical formula?