Suppose a study reports findings that private school students do better academically compared to public school students,
where the researchers are looking at existing schools from both categories as the independent variable and grade point averages as the dependent variable. In this study, the researcher is making use of a
a. quasi-experiment with a nonmanipulated independent variable.
b. laboratory experiment with a high degree of internal validity.
c. correlational study with no manipulations.
d. descriptive study with no manipulations and measures.
Question 2
By adding a control group in an interrupted time-series design, researchers hope to
a. increase nonsystematic variability.
b. increase the internal validity of the study.
c. decrease the clarity of the effects of the independent variable.
d. decrease the reliability of dependent variable.
Evolution of the Sun's luminosity, radius and effective temperature compared to the present Sun
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