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17 Cards in this Set
- Front
- Back
Mathematical Operation
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1. Square or square root
2. Multiply or divide 3. Operations contained within parentheses. 4. First perform operations within the sqaure root sign, then take the square root of the quantity. *Perform fractions above and below dividing line prior to dividing. |
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Population
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Any defined groups of objects, organisms, or events
(contains all members of a defined group) |
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Sample
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Any subset of the population, usually meant to represent the population.
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Parameter
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describes or summarizes a population.
(come from populations) |
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Statistic
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describes or summarizes a sample and estimates a parameter.
(come from samples) |
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Measurement
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Assignment of numbers or values to levels of a variable according to a set of rules.
Basis of scientific observation. |
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Independent Variable
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is manipulated by the researcher.
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Dependent Variable
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is measured
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Confounding Variable
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is uncontrolled that influenced the dependent variable (independent does this also)
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Dichotomous Variable
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has only two categoried (either/or)
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Discrete Variable
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increase or decrease by whole units
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Continuous Variable
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can theoretically assue infinite number of values
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Scales of Measurement
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1.Nominal or Categorical
2.Ordinal 3.Interval 4.Ratio |
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Nominal or Categorical Measurment
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*Classified based on the presence or absense of qualities
*Frequncy data *No information provided on order or magnitude of diferences *Ex: sex, race, religion, political party |
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Ordinal Measurment
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*Classification according to degree of quality i.e. tall>normal>short
*No information about the magnitude of difference |
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Interval Measurment
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*uses a meaningful unit of measure
*allows use of basic arithmetic functions *Ex: shoe size, Fahrenheit scale |
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Ratio Measurment
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*adds an absolute zero point to interval scale (zero implies total absence of the characteristic
*Ex:height and weight (2:1, 1:5) |