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Math
Statistics
Statistics Chapter 1
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Terms in this set (20)
Statistics
the science of collecting, organizing, analyzing, and interpreting data in order to make decisions
collecting data
surveys and censuses
presenting data
charts and tables
describing data
average and median
Analyzing Data
estimation and hypothesis testing
Data
-information collected regarding a subject, it can be numbers, names, locations.
- meaningless w/o context and w/o context, you cannot turn data into information
Catergorical (Qualitative) Variable
a variable taking categories as their values
nominal scale
classifies data into distinct categories in which no ranking is implied
ordinal scale
classifies data into distinct categories in which ranking is implied
numerical (quantitative) variable
a variable having values that represent a counted or measured quantity
discrete variable
arise from a counting process e.g., number of students in our class
continuous variable
arise from a measuring process e.g., temperatures and heights
interval scale
an ordered scale in which the difference between measurements is a meaningful quantity but does not involve a true zero point
ratio scale
an ordered scale in which the difference between the measurements is a meaningful quantity and the measurements have a true zero point
interval scale examples
temperature, SAT score, credit score
ratio scale examples
weight, length, salary, survival time
Population
entire collection of items or individuals about which information is of interest
Sample
a portion of the population selected for study
Parameter
a numerical attribute of a model for a population ex population mean
statistic
a value computed from a sample, corresponding to a parameter ex, Denoted by Roman letters
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