1) which of the following is an example of the field research?

• an evaluation of the effectiveness of public health programs
• an evaluation of the employee reaction to new work conditions
• an evaluation of the effects of the natural disaster
• all of the mentioned

2) a survey is most useful in gathering data on

• the knowledge base of participants
• the demographic information of participants
• the causes and reasons of the participants behavior

3) the smaller number of the participants that is used in studies as if they adequately represent the larger group of interest is the

• sample
• larger population
• accessible population
• target population