The central threat to the internal validity of a simple interrupted time series design is
a. maturation
b. contemporary history
c. regression to the mean
d. pretest sensitization
e. selection bias
Question 2
A local history effect occurs
a. because participants were not randomly assigned to groups
b. when external validity is low
c. as a result of regression to the mean
d. all of the participants are from the same locality
e. when groups experience different events other than the quasi-independent variable
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Hong Kong is a strange situation. A British colony since 1842, it was handed back to China in 1997 a
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