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25 Cards in this Set
- Front
- Back
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Types of Statistis
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Descriptive
Inferential |
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Define Descriptive Statistics
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DATA AT HAND.
reports simply what happened with data at hand and does not generalize to a larger group. |
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Define Inferential Statistics.
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"IN GENERAL"
involve making inferences (drawing conclusions) about a population based on observing samples taken from the population. |
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What is the best type of data?
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unbiased
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Defined "biased", as used in Statistics?
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previous information or knowledge.
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Types of Data
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Individual
Variables Raw Numerical Categorical |
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Define "individual" data
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people, animals, or objects
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Define "variable" data
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characteristics of individuals.
(ie name, gender, age, hair color,...) |
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Define "raw" data
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specific observations (unmodified)
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Define "numerical" data
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observed values (quantities, ie numbers). [aka quantitative data]. if you can calculate an average, the data are numerical.
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Define "categorical" data
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group observations (qualitative data)
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another name for data
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information
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types of variables
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discrete
continuous |
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define "discrete" variable
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only certain values and no values in between (ie # of siblings, ethnicity, ...); have a countable number of possible observations.
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define "continuous" variable
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can be all values
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attribute data =
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categorical data
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define "frequency"
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number of counted occurrences and is always a whole number.
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define "proportion"
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the ratio (or fraction) of wanted data to collected data.
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define "percent"
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is the decimal form of a proportion times by 100.
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define "mean"
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the mean of a data set is the sum of all values divided by the # of data points.
mean = average |
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define "two-way table"
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(or contingency table) is a table in which data are classified in two ways and it must have at least two rows and two columns.
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define "grand total"
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total of all values
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define "marginal total"
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total of either a row or column.
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define "chance variation"
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uncontrollable factors affecting results of a survey.
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Missing Denominator
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Find proportion of segments of data instead of the whole data set.
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