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prob and stats
vocab
23
Mathematics
11th Grade
03/16/2011

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Term

population 

 

Definition
the entire group of individuals or cases about whom we want to learn
Term

sample

 

Definition
a smaller subset of a population from wc we calculate statistics
Term

sample survey

 

Definition

way of gathering data by polling or taking surveys from a sample of population

 

Term

bias 

 

Definition
any systematic way in wc sample fails to represent the overall population
Term
randomization
Definition
to avoid bias. each individual of the pop. must have an equally likely chance of being chosen
Term
matching
Definition
the tendency to make our sample look the way we think it should, rather than randomized
Term
sample size
Definition
the number of indiv. that are in the sample taken from a pop.
Term
census
Definition
a sample that is move of every single individual of the population
Term
population parameter
Definition
a variable represent numerical values about a pop. such as GREEK LETTERS.
Term
sample statistic
Definition
a var. using regular english alphabet to represent numerica valies about a sample
Term
representative
Definition
a sample whose statistics closely reflect the true pop parameters
Term
simple random sample
Definition
where every possible sample of N individuals is equally likely
Term
sampling frame
Definition
the list of individuals fro wc the sample is taken
Term
sampling variability
Definition
the random differences that exist between different possible random samples
Term
stratified random sample
Definition
sampling taken from different subgroups that are each homogenous to get a sample including all kinds
Term
cluster sample
Definition
a sample taken of one HETEROGENOUS subgroup. that s representative of the pop
Term
multistage
Definition
a sample found using two or more strategies to get a truly representative sample
Term
systematic sample
Definition
a sample taken using some systematic approach to choose individuals.
Term
voluntary response varialble
Definition
when some individuals choose to volunteer their response to a study
Term
convenience sample
Definition
made up of individuals who are most convenient to sample
Term
undercoverage
Definition
sampling done in such a way that key groups of the population are missed and te sample becomes unrepresentable
Term
nonresponse bias
Definition
bias introduced when a large fraction og those chosen to respond; do not respond
Term
response bias
Definition
when a large fraction of pop response honestly ..EMOTIONS
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