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Qualitative Data:
data that come in terms of categories like ethnicity and sex and brand name.
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Quantitative Data:
data that consists of numbers.
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Nominal:
this type of data is just like qualitative data; the only difference is that the categories are numbers.
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Ordinal:
the ordering of the numbers makes sense, but other uses of the numbers like adding or subtracting them doesn't.
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Interval and Ratio Data:
data that operations can be done on. (add, subtract, multiply, divide)
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for regression analysis we need interval or ratio variables.
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Discrete Data:
data for which there are a finite or countably finite number of possible values.
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Continuous Data:
data that can take all possible values in an interval.
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Data Set:
refers to a collection of data.
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Observational Study:
observes individuals and measures variables of interest but doesn't attempt to control the changes of responses.
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Experiment:
deliberately imposes some treatment on individuals in order to observe their responses.
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Experimental Unit:
the object that the experiment is being performed on, if it is a person it is called a “subject”.
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Treatment:
A specific experimental condition applied to the experimental units (number of possible combinations of factors).
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Factor:
a variable that relates to different levels like temperature or capacitance.
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Response:
the variable measured to judge the reaction.
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Experimental Design:
manner in which levels of all the factors are changed from one run to the next.
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Balanced:
if every level of every factor appears an equal number of times, the design is said to be balanced
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Lurking Variables:
variables that have an important effect on the response in an experiment but are not included among the variables studied.
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Confounding:
when effects of different variables on the response cannot be distinguished from each other.
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Completely Randomized Design:
can only be done when you have identical experimental units. Randomly assign a number to each block in the
table.
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Randomized Complete Block Design:
Randomly assign a number to each block of a row so that each different unit receives all treatments.
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Blocking:
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This note was uploaded on 04/28/2009 for the course ST 370 taught by Professor Nail during the Spring '08 term at N.C. State.
 Spring '08
 Nail

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