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20 Cards in this Set
- Front
- Back
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average?
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sum of entries/number of entries
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histogram with long right hand tail?
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average>median
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symmetrical histogram?
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average=median
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histogram with long left hand tail?
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average<median
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SD?
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r.m.s of deviations from average
square root (average of (entries)^2)-(average of entries)^2) |
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definition of median?
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center so that 50% are below and 50% are above
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how do adding to every entries on a list affect the avg and SD?
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increase avg by amount add
SD don't chang |
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how do multiplying to every entries on a list affect the avg and SD?
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both SD and avg get multiply
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standard units?
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(value-average)/SD
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what does correlation coefficient r measure?
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linear association
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when is r misleading?
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presence of outliers or non-linear association
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regression estimate?
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estimated y (in standard units)= r*(x in standard units)
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rms error of regression?
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square root (1-r^2) * SD
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multiplication rule of probability?
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P(two events both occur)=(chance of first event) X (conditional chance of second even given that the first has happened)
"AND" |
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addition rule of probability?
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P(first event or second event)=P(first) + P(second)
two events -> must be mutually exclusive (if one happen the other cannot) |
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binomial formula?
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n!/k!(n-k)! * p^K * (1-p)^(n-k)
n-#trials k-#success p-probability of success success/fail must be independent repeated success/failure fixed chance of success |
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expected value of sum of draws?
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number of draws x average of box
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standard error for the sum?
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square root of (number of draws) * SD of box
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calculate SD?
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rms of deviations
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short-cut SD?
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(big value-small value)*square root (prob big value * prob small value)
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