# STAT 503 Quiz I

### Card Set Information

 Author: MRK ID: 258703 Filename: STAT 503 Quiz I Updated: 2014-02-12 17:00:20 Tags: STAT Quiz Folders: Description: Stuff Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user MRK on FreezingBlue Flashcards. What would you like to do?

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
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)

What would you like to do?

Home > Flashcards > Print Preview