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ASU / Economics / ECN 221 / What is the definition of discrete data?

What is the definition of discrete data?

What is the definition of discrete data?

Description

School: Arizona State University
Department: Economics
Course: BUSINESS STATISTICS
Professor: Stefan ruediger
Term: Spring 2017
Tags: Statistics
Cost: 50
Name: Study Guide for Exam 1
Description: These notes cover what will be on our exam from chapters 1-3. I have included a majority of the formulas as well
Uploaded: 02/05/2017
4 Pages 57 Views 1 Unlocks
Reviews


Exam 1: ECN 221


What is the definition of discrete data?



Types of Data

Qualitative

Desen Pine! Nominal Ordinal

• No ranking alloud Ponting allowd

Quantitative

numerical data Interval

· Ranilang allowed . All chavecensics of

SE

No WC O pointi ALWAVS numento

. can be sumenc .no measurable or non-imgic meaning to


What is the definition of continuous data?



manife! TYMCO paint

SIE

TT

395

Zipcodes Mome ownership

credit scor 6 PA temperature INCOM € education level

Population USCA 2 CA cross sectionali vaines para ja

collected durdag cigie time period


What kind of data is qualitative?



Don't forget about the age old question of What does scientific development mean?

2009

population

2010

over a range of

sample Don't forget about the age old question of How do marginal costs and benefits relate to trade offs?
We also discuss several other topics like What is the difference between arithmetic and algebra?

Descriptive => Summarize

Inferential >> making statements

by examining sample

S

sample: o 22

14 3

3 550

(n=10)

Bel. Freq. Cum Rel. Freq. 0172/10 - 0:2 0:2 Don't forget about the age old question of What is legitimate political authority based on?

1110 On 0.220.1*0.3 2110 =0.2 0,3+ 0.2-0.5 12/10 +0.2 10.5*0,2 = 0.7

5 1

2

12/10 -0.2

0.8 +0.25 1.0

10

'I = 10 We also discuss several other topics like How does axial stress vary from neutral axis?

Discrete Data : values that can bc COUNTED

les ex0,1,2,3. Children, vacation days continuas data: Balues that take on any real # Cincluding

decimal points We also discuss several other topics like What is the meaning of london forces in intermolecular interactions?

ex) time, weight class width: Solve for k=> 2 >n where K = of classes

n of data por est. class width: max volne- min value

W

TS

example: 2 >n

2 > 10 K3.32 cround wp!)

k=4

class width: 5-0 =574= 1,25 rounded 2]

Measures of Central

INTILISSION

Generally used

there are shers

(no other's

-

If the data Mode Categorcaj

US

there are

Median outlets

Population

Sample

index point

the value that OCCUYS Most

Stud Soup

episode

OS

* If not whole,

round wp* * when nis

even, mediana

Z-score? Z = X-X X

-M

CANA

Distribution Shape

TRICOU

Symmetric

Syewed

(mean = median

FEN

EVEN

Left Creaviz median

cmean >median)

Per

Measures of Variability

DOELTR

E

S

Range

Variance Lysample: st 6 (Xi-at

standard deviation Lsamples

Largest Valuea smallest value

b> Population -

Empirical Rule

CF

Coefficient of

Variationlov) 2000)

100er

Tu-38 / 20 / 4-0 uro a lot

IL

PA (100)

Measures of Relative

Position

www

Percentile

ber

Quartiles 1154-25** percengle () 4 and 50 percentile caz) L 3*75per cento de las)

where P= percentile

Measures of

Association

or

covariance

br. Sxy

correlation Lx indicates strength

relationship between

2 variables L ranges from - 1 Le correlation causation!

= E(x-7)(y 13(x-772&cy-jo

ramy ECX - ED cy - jo

Sx

Sy

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