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31 Cards in this Set
- Front
- Back
statistics
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science of conducting studies to collect, organize, summarize, analyze and draw conclusions from data
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a variable
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characteristic or attribute that can assume different values
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data values
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each value in a data set (datum)
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descriptive statistics
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consists of the collection, organization, summarization and presentation of data
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a population
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consists of all subjects (human or otherwise) that are being studied
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a sample
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group of subjects selected from a population
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hypothesis testing
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decision making process for evaluating claims about a population based on information obtained from samples
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inferential statistics
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generalizing from samples to populations, performing estimations and hypothesis tests, determining relationships among variables and making predictions
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qualitative variables
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variables that can be placed into distinct categories, according to some characteristic or attribute
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quantitative variables
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variables that are numerical and can be ordered or ranked
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discrete variables
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variables that can be counted
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continuous variables
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infinite number of values between any 2 specific values.
Obtained by measuring, often include fractions/decimals. |
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nominal measurement
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(name)
mutually exclusive (non-overlapping), exhausting categories in which no order or ranking can be imposed on the data |
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ordinal measurement
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(grades, ranking, judging)
categories that can be ranked; however, precise differences between the ranks do not exist |
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interval measurement
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(score, temperature)
ranks data and precise differences between units of measure do exist. no meaningful zero. |
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ratio measurement
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(number)
possesses all characteristics of interval measurement and there exists a true zero. True ratios exist when the same variable is measure on 2 different members of the population |
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Random sampling
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selected by using chance methods or random numbers
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systematic sampling
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numbering each subject of the population and then selecting every __th subject
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stratified sampling
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dividing the population in to groups (strata) according to some characteristic that is important to the study then sampling from each group
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cluster sampling
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divided into groups by some means such as geographic area or schools in a large district, then researcher randomly selects clusters
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observational studies
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researchers merely observe what is happening or what has happened int he past and tries to draw conclusions based on these observations
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experimental studies
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researcher manipulates one of the variables and tries to determine how the manipulation influences other variables
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independent variable
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the variable being manipulated
(explanatory) |
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dependent variable
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result
(outcome) |
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confounding variable
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influences dependent variable but cannot be separated from independent variable
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ambiguous averages
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person can use one of the measure of averages that leans most towards their advantage
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change the subject
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different values are use to represent the same data
(increase of only 3%, but 3% is 6 million dollars) |
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detached statistics
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a statistic where no comparison is made
(this snack has 1/3 fewer calories! ... fewer than what?) |
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implied connections
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claim that attempts to imply connections that do not exist
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misleading graphs
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graphs drawn inappropriately
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faulty questions
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questions in a survey that are influential to sway towards a specific answer
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