1. Chapter One Data Collection
1.4
Sources of Error in Sampling

2. Non-sampling errors are errors that result from the survey process
Non-sampling errors are errors that result from the survey process. They are due to the non-response of individuals selected to be in the survey, inaccurate response, poorly worded questions, bias in the selection of individuals to be in the survey, etc.

3. Sampling error is the error that results in using sampling to estimate information regarding a population. This type of error occurs because a sample does not give complete information about the population.

4. Sources of Non-sampling Error

5. Sources of Non-sampling Error
Incomplete Frame

6. Sources of Non-sampling Error
Incomplete Frame
Non-response

7. Sources of Non-sampling Error
Incomplete Frame
Non-response
Poor Interviewer

8. Sources of Non-sampling Error
Incomplete Frame
Non-response
Poor Interviewer
Incorrect Data Entry

9. Sources of Non-sampling Error
Incomplete Frame
Non-response
Poor Interviewer
Incorrect Data Entry
Poorly worded question
Open versus Closed Question
Ordering of Questions