One Saturday, Adolf was sitting at home when the telephone rang. A local company was making promotional calls and told Adolf he had just won a $1,000 gift certificate. He felt a rush of excitement at the thought of what he could do with $1,000. Now Adolf finds that whenever he hears a telephone ring, he feels a small surge of excitement. In this example of classical conditioning, the conditioned stimulus is:

The type of cloud shown here may produce heavy rainfall. this type of cloud most likely occurs in an area of the sub-saharan that is a) often dry. b) often wet. eliminate c) very windy. d) usually cool.

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.

Segregation or discriminatory practices that occur even when there is no explicit legal enforcement