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15 Cards in this Set

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Statistics:
is the science of collecting, summarizing, analyzing, & drawing conclusions from the data.
Four sources of data:
Census
Existing sources
Survey sampling
Designed experiments
Descriptive Statistics
consists of methods for organizing, displaying, and describing data by using tables, graphs, and summary measures.
Population
consists of all elements (human or otherwise) that are being studied.
Sample
is a subgroup of the population
Data
are the values (measurements or observations) that the variables can assume.
Random Variables
are variables that are determined by chance
Variable
are the characteristics begin studied. Is represented by symbols, such as (x,y,z)or a specified set of values.
Two Types of Variables
Quantitative
Qualitative
Qualitative
Names or labels
Eye color
Breed of dog
Gender
are non-numerical and are based on attributes, attitudes, or opinions.
Quantitative
Age
Height
Weight
Body temperature
Assigned values such as
(0,1,2,3, etc.)
Are numercial measures. Arthmetic operations on the values & provide a meaningful results.
Two types of Quantitative Variables:
Discete: values that can be counted.
Continuous:values that can be measured.
Process of Statistics
*Identify the research objective
*Collect the information needed
*Organize & summarize the information collected
*Draw conclusions from the information collected.
Lower class limits


Upper class limits

Class width
*are the smallest numbers that can belong to a class or a group of numbers.
* Are the largest numbers that can belong to a class or group of numbers.
* the differences between the lower and highest classes or groups of numbers.
Observational Study


Experiment
the researcher observes what is happening and tries to draw conclusions based on these observations.
the researcher manipulates one of the variables and tries to determine how the manipulation influences other variables.