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Frequency polygon
use midpoints, line graph, make sure each end of line is touching x-axis by adding more classes.
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Frequency histogram
bar graph, use midpoints, bars are touching
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Pareto Chart
bar graph, bars aren't touching because it isn't numerical data.
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Empirical Rule
68, 95, 99.7
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Standard Deviation
Square root (  )
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Ogive (cumulative frequency graph)
use class boundaries (little bit below actual class) and cumulative frequency, line graph
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Chebychev's theorem
= at least how many outcomes
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Percentile
number of values below given value
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defective units and what not
number of good C number of good wanted x number of bad C number of bad wanted.
For probability divide by number of total units C number of units wanted.
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P(x) - binomial distribution
P(x) =
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Mean- given probability distribution
mean= Σ(x·p(x))
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Standard deviation- given probability distribution
square root (Σ((x-mean)^2·P(x)))
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mean- binomial distribution
n · p
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standard deviation- binomial distribution
square root (n · p · q)
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equation of regression line
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correlation coefficient (r)
- -1<0<1
- negative # means negative correlation
- positive # means positive correlation
- Closer the number is to zero the weaker the correlation.
- And the closer the number is to -1 or 1 the stronger the correlation
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