___________ refers to the differences between the sample estimate and the actual value of a characteristic of the population.
Random sampling
Non-random sampling
Sampling errors
Non-sampling errors
__________ helps in pretesting of the questionnaire.
Sample survey
Pilot survey
Personal interview
None of these
____________ refers to a group or section of the population from which information is to be obtained.
Sample
Random
______________ is a method of gathering information from individuals.
Sampling
Primary data
Secondary data
Survey
A survey which includes every element of the population is known as ______________.
Census
In a ______________, every individual is given an equal chance of being selected for providing information.
___________ method is expensive.
Telephone interview
Mailing questionnaire
_____________ is a preliminary piece of research conducted before a complete survey to test the effectiveness of the research methodology.
__________ method, the investigator asks questions over the telephone.
The data in a survey are collected by _____________.
