A researcher becomes aware that the judges he is using to make observations are becoming more proficient at their task. This improvement among the judges might suggest that __________ represents a potential threat to the internal validity of the study.
a. instrumentation
b. history
c. maturation
d. selection
Question 2
While conducting a year-long study on friendship patterns in the sixth grade, a researcher discovers that some of the students had reached puberty during that year while others had not.
Which potential threat to internal validity would this example illustrate according to Campbell and his colleagues?
a. selection
b. instrumentation
c. maturation
d. history
A killer whale plays with a ball of ice, soon after a researcher had thrown a snowball at the whale.
The frontal sinus, an airfilled space just behind the brow, is a unique size and shape in each of us
The Canadian ballot is considerably simpler than the American ballot. Note there is nothing like a c
Early in the twentieth century, when malnutrition was common, companies such as this one advertised
Each year, the leaders of the world’s eight most powerful nations meet in a secluded place to make ...
How Many Triangles Can You Make Using the Letter M and 3 Straight Lines?