Astudent proposes this hypothesis in class: "if i make the
angle of a ramp steeper, then a ball rolling down the ramp
will be going faster when it hits the ground."
which part of a hypothesis should the student add to this
that could also be tested in other experiments?
o an explanation based on prior scientific knowledge or
observations
an explanation of how the hypothesis will inspire new
questions
an independent variable that the student controls during
the experiment
an independent variable that is affected by the other
experimental variable

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.