numbers or information describing some charactristics
data
collection of data from every element in a population
census
Measured characteristic of a sample
statistic
Data with the property that the number of possible values is either a finite number or a "countable" number
discrete
level of measurement of data
Ordinal
A situation that occurs when the effects from two or more variables cannot be distinguished from each other
Confounding
A group of subjects that are similar in the ways that might affect the outcome of an experiment
Blocks
a sample of the most available subjects in the population used to obtain quick results.
convenience
difference between a sample result and the true population result
Sampling Error
sample of a particular size selected so that every possible sample of the same size has the same chance of being chosen
simple random sample
collection of methods for planning experiments, obtaining data, organizing, ...etc based on data
Statistics
Subset of a population
Sample
Data consisting of numbers representing counts or measurements
Quantitative
data that covers a range of values without gaps
continuous
Level of measurement of data
Interval
data is observed, measured, and collected at one point in time
Cross sectional
Procedure used in experiments where the subject doesnt know they sare being tested on
Blinding
Repition of an experiment
replication
samples are drawn from each stratum
stratified
Errors from external factors not related to sampling
Non sampling error
effect that occurs when an untreated subject incorrectly believes that he or she is receiving a real treatment
Placebo effect
complete and entire collection of elements to be studied
population
measured characteristic of a population
parameter
Data that can be seperated into different categories distinguished by some nonnumeric characteristic
Qualitative
Level of measurement of data
Nominal
Level of measuremtn of data
Ratio
data collected by going back in time
retrospective
treatment where the person does not know that are getting it
double blind
every kth element is selceted
systematic

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