True you should always suspect it and try to fix it
Answer:
b
Explanation:
extra cards and id makes it easier for people to steal (pickpocket) and get into accounts and all of the others would make it easy
Answer: Matched pairs design
Explanation:
A matched pairs design is a type of study used when 2 treaments are present in an experiment. The individuals in the design can be divided into pairs using a blocking variable, and each pair can then be allocated to treatments at random. This is thus a special type of randomized block design.
In this case the blocking variable can be the various urban areas as 1968 is matched against 1972. Each city can be compared based on 2 measurements. From their each individual can be grouped into pairs and allocated to different treatments.
It has been estimated that there are over 300 varieties of psychopathology. These have been divided into eleven major classes.
