# Shared Flashcard Set

## Details

Statistics Definitions 1
Official Definitions
27
Computer Science
01/25/2010

Term
 Statistics
Definition
 The art/science of collecting, interpreting, and analyzing data (after designing and experimenting)
Term
 Population
Definition
 A group of objects with common identifying characteristics; membership must be clearly defined
Term
 Statistic
Definition
 A property of a sample (X-bar)
Term
 Parameter
Definition
 Characteristic or property of a population
Term
 Random Sampling Variation
Definition
 The uncertainty surrounding estimates of parameters (standard error of the mean)
Term
 Consistent Estimator
Definition
 As sample size is increased, the accuracy of the statistic increases
Term
 Central Limit Theorem
Definition
 The shape of the sampling distribution becomes normally distributed as sample size increases regardless of the shape of the population distribtuion
Term
 Kurtosis
Definition
 'peakedness' of the curve or fourth moment around the mean of a population distribution
Term
 Nominal Data
Definition
 Classified by quality not quantity (example: hair color, zodiac sign)
Term
 Ratio-Scale Data
Definition
 Constant interval and a true zero point (example: weights, volumes)
Term
 Interval-Scale Data
Definition
 Constant interval, zero point is arbitrary (example: C or F temps)
Term
 Ordinal Data
Definition
 Not equal units apart (example: places in a race)
Term
 Compiler
Definition
 Software that translate a program from high level language to machine language and back again
Term
 Random Sample
Definition
 each and every member of the population has an equal and independent chance of being chosen (each and every random set of data from a population has an equal and independent chance)
Term
 Analog Computer
Definition
 Data stored as strength of current
Term
 Digital Computer
Definition
 Data stored as 1 or 0 (binary or machine language)
Term
 Accuracy
Definition
 Closeness to the truth
Term
 Precision
Definition
 Closeness of repeated measurements of the same object
Term
 Bias
Definition
 Pattern to the errors (always over or under estimate)
Term
 Confounding Factor
Definition
 Variables that are not studied in an experiment yet can affect the response variables
Term
 Population Distribution
Definition
 A frequency distribution of some random variable (i.e. X) for a population
Term
 Sampling Distribution
Definition
 A theoretical frequency distribution of some statistic (i.e. X-bar) for many samples of a given sample size from a population
Term
 Sample Distribution
Definition
 A frequency distribution of some random variable (i.e. X) for a sample
Term
 Stratified Random Sample
Definition
 A population is broken into strata based on some variable and the sampling intensities are varied by the strata
Term
 Center of Gravity for a Population Distribution
Definition
 (mu, sigma) -- (μ,σ)
Term
 Center of Gravity for Sample Distribution
Definition
 (X-bar, little s)
Term
 Mechanical Sampling
Definition
 Systematic choice (every 5th person, every 100 feet)
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