According to the article Over the Hill about the Betula study of adult cognition, ____ is a correlation falling within the range found for the relationship between age and medical indicators such as urine and blood tests:

In the United States, cancer is the leading cause of death of adults over age 65

a. True b. False Indicate whether the statement is true or false

Which of the following refers to a measured variable used to determine whether the manipulation has unwittingly caused differences on other variables that might be systematically related to the independent variable?

a. Artifactual variable b. Confound check c. Experimental realism d. Manipulation check