A researcher in Mississippi measured visits to the school counselor for a group of students for three weeks in the spring. In the fall, immediately after a major hurricane, the researcher again measured the students' counselor visits to see if there had been any change. This researcher is using an interrupted time-series design.
a. True
b. False
Indicate whether the statement is true or false
Question 2
When some event other than the program occurs at the same time and affects the outcome of a study, there is a(n) ____ threat.
a. history
b. maturation
c. instrumentation
d. testing