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20 Cards in this Set

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  • Back
What is the summation operator?
Is a symbols used in statistics that represents "the sum of."
Independent Variable
Variables that the researcher controls or manipulates in accordance with the purpose of the investigation.
Dependent Variable
Measure of the effect of the independent variable.
Process of assigning numbers to characteristics according to a defined rule.
Nominal Scale
Classifies objects into categories based on some defined characteristic. (Example: Gender)
Ordinal Scale
Similar to the nominal process except categories are identified and numbers are assigned. Example: grades
Interval Scale
Have all the properties of those measured on an ordinal scale. However, the differences between levels of categories on any part of the scale reflect equal differences in the characteristic measured. (Also called an equal unit scale)
Ratio Scale
As the same properties of the interval scale plus a known, or true, zero point which reflects the absence of the characteristic measured.
Qualitative Variables
Nominal or ordinal measurements
Quantitative Variables
Interval or ratio measurements
A subset of a population (Only members of a sample are included in a research study)
A measure of a characteristic of a population.
A descriptive measure of a sample.
Descriptive Statistics
Used to classify and summarized numerical data.
Inferential Statistics
Consist of procedures for making generalizations about a population by studying a sample from that population.
Coding Data
Involves assigning numerical values to nonnumerica categories. Example Gender - Female = 0, Male = 1
Stem and Leaf Displays
Uselful in exploring distributions of data
Frequency Distribution
An arrangement of values that shows the number of times a give score or group of scores occurs.
Stem and Leaf Displays
Useful strategy for exploring distributions of data
Class Intervals
Intervals of scores in a frequency distribution derived by combining several scores into an interval, thus reducing the number of categories.