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STAT 3113 Exam 1
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Terms in this set (73)
Natural variability
no two individuals are exactly identical
sampling variability
the results from any two samples are not exactly identical
statistical inference
process of forming conclusions about a parameter of a population from statistics computed from individuals in a sample
parameter
summary of data from given variable in population
statistic
summary measure of sample data
population
all individuals of interest
sample
subset of population
nominal categorical
categorical variables where no order or ranking exists among the categories
ordinal categorical
categories have a natural ordering
discrete quantitative
have a countable number of values (typically counts of items)
continuous quantitative
variables that have an uncountable number of values. A potential value exists between every pair of variables
retrospective study
uses either or all of a sample of a historical process data archived over time
observational study
observes individuals and measures variables of interest but does not attempt to influence the responses
designed experiment
- deliberately imposes some treatment on individuals in order to observe their responses
- conclusions on cause and effect
- randomization done to assign units to groups
factors
inputs to a process or the controllable variables associated with an experiment. Combine to form treatment combinations
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