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- StudyBlue
- Pennsylvania
- West Chester University of Pennsylvania
- Mathematics
- Mathematics 121
- Pyott
- Test 1

Nevada C.

population proportion symbol

p

what is the standard deviation for x?

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If the data distribution is bell-shaped, then the interval

μ ± 1σ contains approximately 68% of the values

μ ± 2σ contains approximately 95% of the values

μ ± 3σ contains virtually all of the data values (99,7)

if data isn't bell shaped and symmetric what rule do u use

chebyshev

population variance

σ^2

sample standard deviation symbol

s (how far it is from mean)

sample variance symbol

s^2

Coefficient of variation

ratio of standard deviation to the mean

CV

Mutually exclusive event

When one event happens another event can't happen

bimodal

separation of data

population mean symbol

Sample Proportion Symbol

^

p --> "p hat"

sample mean symbol

_

x

relative frequency

f/n --> class frequency DIVIDE total of all frequencies

bimodal

separation of data

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__

x= sensitive to extreme values

m= resistant to extreme values

__

x > m= skewed____

right

__

x < m= skewed____

left

__

x =m=

symmetric

chebyshev rule

- no expectation of data for (m±σ)
- 75% (m±2σ)
- 89% (m±3σ)

z-score

x minus mean divided by standard deviation

quartiles

Q1= 25%

Q2=50%

Q3=75%

Q4=100%

5 number summary

min

Q1

median

Q3

max

IQR?

=Q3-Q1

highly resistant to outliers

Parameter vs statistic

paramater- the summary description of a given variable in a **population **

statistic- the summary description of a variable in a **sample **

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