Khristy wants to determine the role of sleep in academic performance. in no specific way, she divides her volunteers into two groups—a control group that will sleep the standard eight hours a night and a second group that will sleep five hours a night. she then administers an objective academic assessment to all participants. what type of study is khristy conducting

Randomized controlled trial.

Explanation:

Randomized controlled trial is a scientific study used to test the effectiveness of therapeutic treatments in a patient population. This type of study is also used to evaluate the colloter effects of some therapeutic treatment. In this type of study, the volunteers for the tests are randomly chosen, ie randomly, and the study uses all variables in a controlled manner, so that it is possible to evaluate the relationship between all variables used. An example of a randomized controlled trial is the Khristy study.

i only have part a but here is the first one: - lewis and clark are born

- lewis marries sacajawea and clark is jealous  

- clark drowns lewis and then goes to jail