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Sampling and Experiments Vocabulary

Across
a measurement derived from a sample, usually intended to be representative of an entire population.
takes numerical values for which arithmetic operations such as adding and averaging make sense. Ex) age, height, grade level in school.
an experiment where the experimenters don’t know the treatments each subject is receiving AND the subjects don’t know which treatment they are receiving.
the result of measuring or counting every individual in a population.
the result of measuring or counting a portion of a population. The larger the sample size, the more accurate the estimate for the population.
every individual in the population has an equal chance of being selected.
Down
a group of individuals that receive no treatment.
places an individual into one of several groups or categories. Ex) gender, letter grade in class.
observes individuals and measures variables of interest. Ex) How many hours do students spend studying each night?
results when a population is separated into two or more subgroups, called strata, and the simple random samples are selected from each strata in proportion to the relative size of the strata.
a sample that is selected by a method that ensures every possible sample of a given size has an equal chance of being selected.
an additional variable that influences the results of a study or experiment.
a sample made up of individuals that are easiest to reach.
any specified condition applied to individuals.
observing individual responses after some kind of treatment to answer a question about a given population.
the process of collecting data from a sample of a population.
results when a population is separated into two or more subgroups, called clusters, and then a simple random sample of clusters is selected.
occurs when some individuals in a population have a greater chance of being selected for a sample than others.