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Intro to Prob and Stats
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Terms in this set (15)
Statistic
The science of conducting studies to collect, organize, summarize, analyze, and draw conclusions from data.
Variable
The science of conducting studies to collect, organize, summarize, analyze, and draw conclusions from data.
Data
The raw material that is collected by making observations, taking measurements, counting, or asking questions. The measurements or observations that the variable can become.
Data Set
A collection of data values.
Descriptive Statistics
The collection, organization, summarization, and presentation of data.
Inferential Statistics
Generalizing data from samples to populations, performing estimations and hypothesis tests, determining relationships among variables, and making predictions.
Population
All subjects that are being studied.
Qualitative Variables
A variable that can be placed into distinct categories, according to some characteristic or attribute. (Also called Categorical Data)
Quantitative Variables
A variable that is numerical in nature and that can be ordered or ranked. (Also called Numerical Data)
Discrete Variables
A variable that assumes values that can be counted. (Example: The number of students in a classroom)
Continuous Variables
A variable that can assume all values between any two specific values. A variable obtained by measuring. (Example: The distance between to towns.)
Nominal
Classifies data into mutually exclusive (don't overlap) categories in which no order or ranking can be imposed on the data.
Ordinal
Classifies data into categories that can be ranked; however, precise differences between the ranks do not exist. Inequality signs could be used to organize data.
Interval
Ranks data and precise difference between units of measure do exist; however, there is no meaningful zero.
Ratio
Possesses all the characteristics of interval measurement, and a true zero does exist. True ratios exist when the same variable is measured on two different members of the population.
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