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TAMU STAT 211 Exam 1(completed)2022
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Define: categorical variable variable that takes values in one of several categories ex: gender, race, major Define: quantitative variable variable that takes numerical values where arithmetic makes sense ex: age, SAT score, time until arrival 00:03 01:33 Define: observa...

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  • August 1, 2022
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  • 2022/2023
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TAMU STAT 211 Exam 1
Define: categorical variable - Answer variable that takes values in one of several
categories

ex: gender, race, major

Define: quantitative variable - Answer variable that takes numerical values where
arithmetic makes sense

ex: age, SAT score, time until arrival

Define: observational study - Answer Passive data collection. Nothing is done to
influence the variables on the units in the sample.

tends to be more cost effective

Define: experiment - Answer Treatment is applied to some units. Variables on units are
measured with the intention of determining if the treatment affects the variables.

Whats the difference between a histogram and a bar graph? - Answer Histogram bars
touch and their width is related to the value range, used for quantitative data

Bar graph bars do not bars touch and their width is not related to the value range, used
for categorical data

Define: Unit - Answer Single entity who's quantity is measured

Define: Population - Answer The entire set of units

Define: Sample - Answer A set of selected units and their associated measurements

Define: census - Answer Sample that attempts to include entire population

Define: Parameter - Answer Fixed (and usually unknown) number that describes the
population

Define: Statistic - Answer Number from the sample that estimates a population
parameter

Define: Randomized experiment - Answer Subjects are randomly assigned to the
assigned and control groups

Define: Double-blind experiment - Answer Neither the subjects nor those collecting the
data know who is the control/experimental group

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