Answer:
proposed explanation
Explanation:
Scientific research begins with the posing of a solvable problem. The next step is to offer a possible solution to the problem through a proposition that can be declared true or false. Therefore, the hypothesis is the testable proposition that may prove to be the solution of the problem. Based on this concept, we can say that in scientific research, the term "hypothesis" refers to the proposed explanation of the problem that the research wishes to solve.
Because the south had crop growth that the north needed
Answer: Variable-interval
Explanation:
Variable-interval schedule is the reinforcement schedule in which reinforcement is implied to response after certain passage of time.
This time is usually unpredictable as variable schedule.
According to the question, variable interval schedule is reinforced through Professor Wallace as he is going to give pop quizzes to students at uncertain time of interval which is not predictable or has varying schedule.
Other options are incorrect because fixed ratio schedule, variable ratio schedule and fixed interval schedule are not schedule on which Professor's surprise quiz will reinforce.Thus, the correct option is variable interval schedule.
