Denise is a voluntary participant in a psychological research study. The researcher uses lemons, string, and double-tipped cotton swabs. What variable is the researcher most likely investigating?

Describe the Oedipus complex

What will be an ideal response?

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