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17 Cards in this Set

  • Front
  • Back
Mathematical Operation
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.
Any defined groups of objects, organisms, or events
(contains all members of a defined group)
Any subset of the population, usually meant to represent the population.
describes or summarizes a population.
(come from populations)
describes or summarizes a sample and estimates a parameter.
(come from samples)
Assignment of numbers or values to levels of a variable according to a set of rules.
Basis of scientific observation.
Independent Variable
is manipulated by the researcher.
Dependent Variable
is measured
Confounding Variable
is uncontrolled that influenced the dependent variable (independent does this also)
Dichotomous Variable
has only two categoried (either/or)
Discrete Variable
increase or decrease by whole units
Continuous Variable
can theoretically assue infinite number of values
Scales of Measurement
1.Nominal or Categorical
Nominal or Categorical Measurment
*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
Ordinal Measurment
*Classification according to degree of quality i.e. tall>normal>short
*No information about the magnitude of difference
Interval Measurment
*uses a meaningful unit of measure
*allows use of basic arithmetic functions
*Ex: shoe size, Fahrenheit scale
Ratio Measurment
*adds an absolute zero point to interval scale (zero implies total absence of the characteristic
*Ex:height and weight (2:1, 1:5)