•
Statistics
is the science of data, data is the result/outcome of an experiment (numeric or labels)= the items upon which this
information is collected are called
experimental units
.
•
Target population:
group of items about which the investigator ultimately wants to draw inference.
•
Sample population:
is the group of items from which the sample is actually drawn. (groups
could
be the same.)
•
Census Data
: measurements are obtained from every unit in the target population.
•
Sample:
a subset of the entire population that is captured in a study. The variable(s) of interest is measured on each item of the
sample and statistics are computed based on the “values” of these variables.
•
SimpleRandomSample(SRS
): a sample of the population where every unit has an equal opportunity to be selected.
•
Confounding:
when the investigator can’t separate the effects of one from the other.
•
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 Fall '07
 CarlR.Gumina
 Statistics, Bar chart, investigator, target population, 45.05 sec, 135.5lb

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