"a common science-fair project involves testing the effect of music on the growth of plants. for one of these projects, a sample of 24 newly sprouted bean plans is obtained. these plants are randomly assigned to one of four treatments, with 6 plants in each group. each group of 6 plants is exposed to a different kind of music: classical, jazz, country, or rock. after two weeks, the height of each plant is measured and recorded. what test will tell you whether the type of music played affects plant growth?

Multicultural studies report that the best way to develop babies' sleep rhythms seems to be

Asociologist wants to study a culture that occurs in some women’s prisons: “state families,” in which individual prisoners take on certain roles within a group of like-minded prisoners. there is previous evidence that younger prisoners will use older inmates who play the roles of grandparents as a resource before they will turn to staff for and advice. the lieutenant in charge of a dorm of long-term prisoners offers to gather volunteers to speak to the researcher and also offers to vouch for the integrity of the researcher. the use of this staff is: a valid use of a statistical technique referred to “snowball sampling” wherein the inclusion of the first subject leads to the recruitment of another one subject.a useful tactic in obtaining a sample of prisoners who both meet the criteria and who will be honest with the researcher.wrong and is prohibited; subject selection needs to be free from intervention by prison authorities or prisoners.acceptable only when the researcher’s irb grants a special waiver.

Astudent answers 86 problems on a test correctly and receives a grade of 98% how many problems were worth the same number of points