Dr. Smith was interested in whether there would be a reduction in ...

[jc611]

Dr. Smith was interested in whether there would be a reduction in the number of crimes in the central city once closed-circuit cameras went up and were monitored by police. To accomplish this study, Dr. Smith looked at the police records for the four-square-block area where the cameras were installed each week for six months. Dr. Smith was using what method?
 
  a. cohort design
  b. time-series design
  c. classical experiment
  d. quasi-experimental design

Question 2

External validity in an experimental design refers to:
 
  a. the researcher's ability to be sure that they are measuring what they think they are measuring
  b. the lack of concern with issues internal to the study
  c. the ability to apply findings to other populations
  d. the ability to know your measures are consistent

[mceravolo]

Answer to Question 1

b

Answer to Question 2

c

[jc611]

TY

[mceravolo]

You're welcome