in a test of the effects of sleep deprivation on problem - solving skills, research participants are allowed…

in a test of the effects of sleep deprivation on problem - solving skills, research participants are allowed to sleep either 4 or 8 hours on each of three consecutive nights. this research is an example of\na naturalistic observation.\nb survey research.\nc a case study.\nd an experiment.

in a test of the effects of sleep deprivation on problem - solving skills, research participants are allowed to sleep either 4 or 8 hours on each of three consecutive nights. this research is an example of\na naturalistic observation.\nb survey research.\nc a case study.\nd an experiment.

Answer

Brief Explanations:

In an experiment, variables are manipulated. Here, the amount of sleep (4 or 8 hours) is the manipulated independent variable to observe its effect on problem - solving skills (dependent variable). Naturalistic observation involves watching behavior in natural settings without manipulation. Survey research uses questionnaires or interviews. A case study focuses on an in - depth analysis of a single individual or small group.

Answer:

D. an experiment