Chap 1: Defining and collecting data Flashcards Preview

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Flashcards in Chap 1: Defining and collecting data Deck (24):
1

HMany types of variable? Listed?

2 types: categorical & numerical variables

2

categorical variables?

= qualitative variable, only placed into categories: Y or N
Ex: gender, do you have fb profile?

3

numerical?

= quantitative variable, represent a counted or measured quantity

4

types of numerical?

2 types: discrete and continuous

5

discrete variable?

values from COUNTING

6

continuous var

values from MEASURING
Ex: time spent

7

measurement scale for categorical var?

nominal n ordinal

8

nominal scale?

var classified into distinct categories
no ranking
weakest measurement

9

ordinal scale

distinct categories
implied ranking
stronger than nominal

10

scale for numerical var?

interval n ratio scale

11

interval scale?

an ordered scale
difference btw measurement not involve a true zero point

12

ratio scale?

an ordered scale
involve a true zero point

13

sources of data?

2 sources: primary & secondary

14

population?

all items/individuals to make conclusions
measured by parameters

15

sample

a portion of population
measured by statistics

16

HMany data formating?

2 formats: structured n unstructured format

17

structured format

a repeating pattern

18

unstructured format

no repeating pattern

19

outliers?

values excessively different
-> not errors but requiring 2nd review

20

mising value?

values cant be collected

21

a recored variable?

var replace original variables

22

one and only one category is called?

mutually exclusive

23

set of categories created for new, recorded variables is called?

collectively exhaustive

24

systematic sample?

k=N/n
k items
N items
n groups