STAT 503 Quiz I

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Author:
MRK
ID:
258703
Filename:
STAT 503 Quiz I
Updated:
2014-02-12 17:00:20
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STAT Quiz
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  1. discrete
    type of quantitative variable that can not be divided (whole # only)
  2. Tail to the left
    skewed left
  3. If histogram is symmetric... mean and median
    are similar
  4. If histogram is asymmetric median is...
    more useful than mean
  5. 5 Number summery
    • min
    • max
    • Q1
    • median
    • Q2
  6. outlier
    1.5*IQR +/- Q1/3
  7. Standard Deviation
    • how are on average samples are from the mean
  8. Sample Variance
    Square of the Sample standard Deviation
  9. Coefficient of Variation
    • gives a unitless quantity
    • it is sd/ȳ
    • hard when close to zero
    • need non-negative
  10. When bell shaped:
    +/- 1 SD has ___ %
    +/- 2 SD has ___ %
    +/- 3 SD has ___ %
    • 68
    • 95
    • 99
  11. linear transformation
    • linear = 1 multiplicative factor & 1 additive factor
    • For means: use same formula
    • For SD: additive factor is cancelled and just want absolute value of multiplicative
    • For Variance: square the multiplicative
  12. Frequency Interpretation
    • Interpreting probability that you would actually experiment each time
    • Not the only way to interpret
  13. Probability of non-overlapping events
    OR events
    add P{1} + P{2}
  14. Probablility of independent events
    AND events
    P{1}*P{2}
  15. For simultaneous events visualize with...
    venn diagram
  16. For sequential events visualize with...
    • Probability trees
    • (medical tests)
    • AND events
  17. sensitivity v. specificity
    • sensitivity- % true positives
    • Specificity- % True negatives
  18. Pr(x|y)
    Pr(x*y) / Pr(y)

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