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15 Cards in this Set
- Front
- Back
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Statistics:
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is the science of collecting, summarizing, analyzing, & drawing conclusions from the data.
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Four sources of data:
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Census
Existing sources Survey sampling Designed experiments |
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Descriptive Statistics
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consists of methods for organizing, displaying, and describing data by using tables, graphs, and summary measures.
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Population
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consists of all elements (human or otherwise) that are being studied.
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Sample
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is a subgroup of the population
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Data
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are the values (measurements or observations) that the variables can assume.
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Random Variables
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are variables that are determined by chance
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Variable
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are the characteristics begin studied. Is represented by symbols, such as (x,y,z)or a specified set of values.
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Two Types of Variables
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Quantitative
Qualitative |
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Qualitative
Names or labels Eye color Breed of dog Gender |
are non-numerical and are based on attributes, attitudes, or opinions.
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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.
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Two types of Quantitative Variables:
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Discete: values that can be counted.
Continuous:values that can be measured. |
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Process of Statistics
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*Identify the research objective
*Collect the information needed *Organize & summarize the information collected *Draw conclusions from the information collected. |
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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. |
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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. |
