Week Eight Flashcards
What is availability sampling
Sampling elements are based on convenience
What is census
Research in which information is obtained through the responses that all available members of an entire population give to questions
What is a cluster
A naturally occurring mixed aggregate of elements of the population
What is the confidence interval
The range defined by the confidence limits for a sample statistic
What is confidence limits
The upper and lower bounds around an estimate of a population parameter based on a sample statistic. The confidence linked shows how much confidence can be placed in the estimate
What is disproportionate stratified sampling
Sampling in which elements are selected from strata in different proportions from those that appear in the population.
What are enumeration units
Units that contain one or more elements and that are listed in a sampling frame
What are inferential statistics
Mathematical tools for estimating how likely it is that a statistics result based on data from a random sample is representative of the population from which the sample is assumed to have been selected
What is multistage cluster sampling
Sampling in which elements are selected in two or more stages, with the first stage being the random selection of naturally occurring clusters and the last stage being. The random selection of multilevel elements within clusters
What is non-probability sampling methods
Sampling methods in which the probability of selection of population elements is unknown
What is periodicity
A sequence of elements (in a list to be sampled) that varies in some regular, periodic pattern
What is population parameter
The value of a statistic, such as a mean, computed using the data for the entire population: a sample statistic is an estimate of a population parameter
What is probability sampling method
Sampling methods that rely on a random or chance, selection method so that the probability of selection of population elements is known
What is proportionate stratified sampling
Sampling methods in which elements are selected from strata in exact proportion to their representation in the population
What is purposive sampling?
A nonprobability sampling method in which elements are selected for a purpose, usually because of their unique position. Sometimes referred to as judgement sampling
What is quota sampling
A nonprobability sampling method in which elements are selected to ensure that the sample represents certain characteristics in proportion to their prevalence in the population
What is random digit Dialing
The random dialling by a machine of numbers within designated phone prefixes, which creates a random sample for phone surveys
What is random number table
A table containing lists of numbers that are ordered solely on the basis of chance; it is used for drawing a random sample.
What is random sampling error
Differences in population and the sample that are due to chance
What is simple random sampling
A method of sampling in which every sample element is selected only on the basis of chance, through a random process
What is stratified random sampling
A method of sampling in which sample elements are selected serparately from population strata that are identified in advance by the researcher
What is systematic bias
Overrepresentation or underrepresentation of some population characteristics in a sample resulting from the method used to select the sample; a sample shaped by systematic sampling error is a biased sample.
What is systematic random sampling
A method of sampling in which sample elements are selected from a list or from sequential files, with every nth element being selected after the first element is selected randomly within the first interval
