When the null hypothesis is rejected,
a. you are stating that there is only one population of research participants.
b. you are stating that the independent variable had no effect on the dependent variable.
c. you are stating that nothing (null) was found.
d. you are saying that your finding is statistically significant.
Question 2
In a single-case experiment that is essentially an interrupted time series, the ability to determine that the treatment has an effect
a. requires that the participant understand that his or her behavior must change.
b. requires that the experimenter must be able to predict what the behavior would have been without the treatment.
c. requires that the mean of the pretreatment session be significantly lower than the mean of the posttreatment session.
d. requires that the mean of all pretreatment sessions be significantly higher than the mean of all of the posttreatment sessions.
Population genetics sample question
Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the
The Median Age of the U.S. Population
The wobble hypothesis
Working-Age Fraction of the U.S. Population, 1950–2050
One hypothesis for the evolution of the eukaryotes