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- Descriptive statistics
- Summary of formulas
A summary of useful formulas used in examining descriptive statistics
Commonly used symbols
- The symbol
means to add or to find the sum.
-
= the number of data values in a sample
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= the number of people, things, etc. in the population
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= the sample mean
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= the sample standard deviation
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= the population mean
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= the population standard deviation
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= frequency
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= numerical value
Commonly used expressions
-
= A value multiplied by its respective frequency
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= The sum of the values
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= The sum of values multiplied by their respective frequencies
-
or
= Deviations from the mean (how far a value is from the mean)
-
or
= Deviations squared
-
or
= The deviations squared and multiplied by their frequencies
Mean Formulas:
-
or
-
or
=
Standard Deviation Formulas:
-
or
-
or
Formulas Relating a Value, the Mean, and the Standard Deviation:
- value = mean + (#ofSTDEVs)(standard deviation), where #ofSTDEVs = the number of standard deviations
-
=
+ (#ofSTDEVs)(
)
-
=
+ (#ofSTDEVs)(
)
Questions & Answers
discuss how the following factors such as predation risk, competition and habitat structure influence animal's foraging behavior in essay form
location of cervical vertebra
define biology infour way
Explain the following terms .
(1) Abiotic factors in an ecosystem
Abiotic factors are non living components of ecosystem.These include physical and chemical elements like temperature,light,water,soil,air quality and oxygen etc
Qasim
Define the term Abiotic
Marial
passive process of transport of low-molecular weight material according to its concentration gradient
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what is production?
Catherine
how did the oxygen help a human being
how did the nutrition help the plants
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Source:
OpenStax, Collaborative statistics-parzen remix. OpenStax CNX. Jul 15, 2009 Download for free at http://legacy.cnx.org/content/col10732/1.2
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