# Chapter 3

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1. Measure of center
the value at the center or middle data set
2. E
sum of a set of values
3. x
the variable for individual data values
4. n
number of data values in a sample
5. N
represents the number of data values in a population
6. bimodal
two modes
7. multimodal
more than two modes
8. midrange
• maximum value + minimum value
• ____________________________
•                       2
9. decimal point rule for measures of center
carry one more decimal place than is present in the original set of values
10. Measures of center
• mean
• median
• mode
• midrange
11. variance is
s2 standard diviation squared
12. Range rule of thumb
Minimum "usual" value = (mean) - 2 x (standard deviation)

Maximum "usual" value = (mean) + 2 x (standard deviation)
13. Range rule of thumb for estimating a value of the standard deviation s To roughly estimate the standard deviation from a collection of known sample data use
To roughly estimate the standard deviation from a collection of known sample data use

• s = range
•      -------
•         4
14. Empirical rule
• For bell shaped distributions
• 68-95-99.7
15. Chebyshev's Theorem
1-1/k2
16. CV
• cv= s    X 100%
•      ---
•      __
•       X
17. z score is rounded to
2 decimal places
18. z score
z= x- mean devided by s
19. percintile of value x
percentile of value x= number of values less than x devided by total number of values multiplied by 100
20. Converting from the kth percentile to the corresponding data value
Locator = K (percentile being used) devided by 100 multiplied by n (total number of values in the data set)
 Author: servinggod247 ID: 276281 Card Set: Chapter 3 Updated: 2014-06-06 21:00:16 Tags: statistics Folders: Description: test one Show Answers: