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A probability sample that is used when no list of elements exists. the sampling frame initially consists of clusters of elements
a nonprobability sample in which he selection of elements is determined by the researcher's convinience
the total proportion of observations at or below a value in a frequency distribution
an array of rows and columns that stores the values of a set of variables for all the cases in a data set
a number that, because of its definition and formula, describes certain characteristics or properties of a batch of numbers
Record that is not part of a regular, ongoing record-keeping enterprise but instead is produced and preserved in a more casual, personal, or accidental manner
Estimator (μ or p)
A statistic based on sample observations that is used to estimate the numerical value of an unknown population parameter
the mean or average value of a sample statistic based on repeated samples from a population
observation of physical traces of behavior. May misinterpret data, but do not affect the things being studied
persons who are willing to be interviewed about the activities and behavior of themselves and of the group to which they belong. They also help the researcher engaged in participant observation to interpret group behavior.
Procedures that inform potential research subjects about the proposed research in which they are being asked to participate; the principle that researchers must obtain the freely given consent of human subjects before they particitare in a research project
Institutional Review Board (IRB)
Panel to which researchers must submit descriptions of proposed research involving human subjects for the purpose of ethics review
demonstration that multiple analysts, following the same content analysis procedure, agree and obtain the same measurements
Margin of Error
The difference between a sample estimate and a corresponding population parameter that arises because only a portion of a population is observed
a distribution of values in which fewer observations lie to the left of the middle value and thaaose observations are fairly distant from the mean
a sample for which each element in the total population has an unknown probability of being selected
observations in which the observer becomes a regular participant in the activities of those being observed
Population Parameter (θ or P)
A characteristic or an attribute in a population (not a sample) that can be quantified.
a distribution of values in which fewer observations lie to the right of the middle value and thaaose observations are fairly distant from the mean
a sample for which each element in the total population has a known probability of being selected
Simple Random Sample
a nonprobability sample in which a researcher uses discretion in selecting elements for observation
a poll intended not to collect information, but to feed respondents (often) false and damaging information about a candidate or cause
A nonprobability sample in which elements are sampled in proportion to their representation in the population
proportion of total number of observations in a frequency distribution that have a particular value
a measure of central tendency that is not sensitive to one or a few extreme values in a distribution
the proportion of respondents selected for participation in a survey who actually participate
the pattern of responding to a series of questions in a similar fashion without careful reading of each question
A written record that is enduring and easily accessed and covers and extensive period of time. Useful in observing changes, low costs
Any subset of units collected in some manner from a population. (The selection of the population selected for the study)
occurs whenever some elements of a population are systematically excluded from a sample. it is usually due to an incomplete sampling frame or a nonprobability method of selecting elements
The degree to which sample subjects represent the population from which they are drawn
A theoretical (non-observed) distribution of sample statistics calculated on samples of size N that, if know, permits the calculation of confidence intervals and the test of statistical hypotheses. Measure the mean, variations, and shape of distribution
The population from which the sample is drawn. Ideally, it is the same as the total population of interest to a study
The entity listed in a sampling frame. it may be the same as an element or it may be a group or cluster of elements
An interview guide is provided, giving previous knowledge if the questions being asked and in what order
Simple Random Sample
A probability sample in which each element has an equal chance of being selected
a question in which the respondent is asked to agree with a single substantive statement
A sample in which respondents are asked to identify additional members of the population
a measure of dispersion of data points about the mean for interval and ratio related data. difference between each score and the mean, averaged
the standard deviation or measure of variability or dispersion of a sampling distribution. Increasing the sample size reduces this by raising confidence in having the true mean
the mathematical theory and techniques for making conjectures about he unknown characteristics (parameters) of populations based on samples
A probability sample in which elements sharing one or more characteristics are grouped and elements are selected from each group in proportion to the group's representation in the total population
A probability sample in which elements are selected from a list at predetermined intervals
the mean calculated by excluding a specified proportion of cases from each end of the distribution
Validity, Reactivity, Cost and availability of data
Considerations for selecting a method for collecting data
a measure of dispersion of data points about hte mean for interval and ratio level data. the average of squared deviations
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