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Math 2 Unit 4 Vocabulary
Math 2 Unit 4 Vocabulary
26
Mathematics
10th Grade
07/11/2012

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Term
Biased Sample
Definition

over-represents or under-represents part of the population

Term
Unbiased Sample
Definition

representative subset of the population you want information about

Term
Frequency Distribution
Definition

an arrangement of the values (usually in table format) that one or more variables take in a sample

Term
Dot Plot
Definition

statistical chart consisting of data points plotted on a simple scale, typically using filled in circles

Term
Empirical Rule
Definition

 68% of data lies within 1 standard deviation of the mean; 95% of data lies within 2 standard deviations of the mean; 99.7% of data lies within 3 standard deviations of the mean

Term
Measure of Variability
Definition

a statistic that tells you how dispersed, or spread out, data values are (e.g. range, variance, and standard deviation)

 

Term
Variance
Definition

the square of standard deviation, σ2

Term
Standard Deviation
Definition

a measure of dispersion from the mean that uses all data values; can be for a sample (Sx) or a population(σx)

Term
Normal Distribution
Definition

modeled by a bell-shaped curve that is symmetric about the mean with a total area under the curve of 1 and has an equal mean, median, and mode

Term
Observational Study
Definition

draws inferences about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the investigator

Term
mean
Definition

a measure of center of a set of data; symbolized by μ for a population and xbar for a sample

Term
Population
Definition

collection of all outcomes, responses, measurements, or counts.

Term
Population Parameter
Definition

 similar to a sample statistic but generally an unobservable quantity describing a property of a statistical population

 

Term
Sample
Definition

a subset of a population

Term
Simple Random Sample
Definition

subset of individuals (a sample) chosen from a larger set (a population) such that each individual has the same probability of being chosen at any stage during the sampling process

Term
Standard Normal Curve
Definition

the normal distribution with mean 0 and standard deviation 1.

Term
Sample Mean Formula
Definition

xbar = μ

Term
Standard Deviation of a Sampling Mean Formula
Definition
σxbar = σ/sqrt(n)
Term
Range
Definition

simple measure of dispersion that uses 2 data values, Max-Min

 

Term
Deviation
Definition

difference between a data point and the mean

Term
Data
Definition

consists of info coming from observation counts, measurements, or responses.

Term
Statistics
Definition

the science of collecting, organizing, analyzing, and interpreting data

 

Term
Symmetric Distribution
Definition

when a vertical line can be drawn through the middle & resulting halves are mirror images

 

Term
Uniform Distribution
Definition

has equal frequency throughout distribution

Term
Skewed Left Distribution
Definition

tail extends to the left

Term
Skewed Right Distribution
Definition

tail extends to the right

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