Which of the following is not a common source of reliable data?

	1.	data published by governments, industries and individuals.
	2.	data obtained from experimental designs.
	3.	data fabricated by experiment designers.
	4.	data obtained from survey.
	5.	data collected from observational study.

Which of the following is NOT a probability sample?

	1.	Simple random sample.
	2.	Systematic sample.
	3.	Quota sample.
	4.	Stratified sample.
	5.	Cluster sample

which of the following is not a common survey error?

	1.	Sampling error.
	2.	Type I error.
	3.	Coverage error.
	4.	Measurement error.
	5.	Nonresponse error.

Which of the follow is a coverage error?

	1.	Certain groups of subjects are excluded from the frame and have no chance of being selected in the sample.
	2.	Failure to collect data on all subjects in the sample.
	3.	Inaccuracies in the recorded responses that occur because of a weakness in question wording, an interviewer?s effect on the respondent, or the effort made by the respondent.
	4.	The chance differences from sample to sample based on the probability of particular individuals or items being selected in the particular samples. This error always exists in a survey.
	5.	all of the above
	6.	none of the above

	1.	Items or individuals are chosen without regards to their probability of occurrence.
	2.	The subjects of the sample are chosen on the basis of known probability.
	3.	Every individual or item from the frame has an equal chance of being selected. Selection may be with replacement or without replacement.
	4.	Decide on a sample size, n; divide frame of N individuals into groups of k individuals, k = N/n; randomly select one individual from the first group; select every kth individual thereafter.
	5.	The population is divided into two or more groups according to some common characteristic, e.g., whether an employee is full-time or part-time; simple random sample is selected from each group; the two or more samples are combined into one.
	6.	The population is divided into several parts, e.g., counties or election districts, in which each is representative of the population; a simple random sample is selected from each cluster; the samples are combined into one.