A political scientist uses a survey to determine whether college students’ sleeping habits are related to their grade point averages. This researcher is using the descriptive survey research design.

A graph of a two-factor study indicates an interaction when the lines on the graph ____.

Milgram’s obedience study is ethically questionable because the ____.

A correlation of r = −0.90 means that there is essentially no consistent relationship between X and Y.

Which hypothesis is problematic because it cannot be tested?

Which question can be addressed with a descriptive strategy?

A researcher conducts a survey examining eating and sleeping behavior as well as academic performance for a group of elementary school children. The results of the survey indicate that the children who eat a more nutritious breakfast tend to have better grades than the children who have a breakfast low in nutrition. However, the research suspects that the children’s parents may be responsible for this relationship. Specifically, the better-educated parents probably encourage their children to eat better food and work harder in school compared to parents with less education. If the researcher is correct, this is an example of the ____.

A differential research design comes closer to being a true experiment that other similar designs.

Any factor that limits the ability to generalize the results of the study is a threat to ____.

A researcher developed a new intelligence test for elementary school children. However, the researcher fears that the scores from the test may actually be measuring the children’s reading ability. To show that the test is really measuring intelligence and not reading ability, the researcher must demonstrate ____validity.