In the previous question the intercept would be

Suppose someone asks you, "On a scale from 1 to 10, with 1 being 'all nature' and 10 being 'all nurture' where would you put Alzheimer's disease?" Based on information provided in the text, the BEST answer probably is:

a) "definitely 1" b) "probably a 2 or a 3" c) "a 5, I guess" d) "most certainly a 9 or 10"

Dr. Meir is conducting a study and uses heart rate as a measure of general anxiety level. Defining anxiety level in this way would:

a. represent an operational definition b. be a testable hypothesis c. provide empirical verification of the concept d. violate general research ethics