Chap 1: Defining and collecting data

Question 1

HMany types of variable? Listed?

Answer 1

2 types: categorical & numerical variables

Question 2

categorical variables?

Answer 2

= qualitative variable, only placed into categories: Y or N

Ex: gender, do you have fb profile?

Question 3

numerical?

Answer 3

= quantitative variable, represent a counted or measured quantity

Question 4

types of numerical?

Answer 4

2 types: discrete and continuous

Question 5

discrete variable?

Answer 5

values from COUNTING

Question 6

continuous var

Answer 6

values from MEASURING

Ex: time spent

Question 7

measurement scale for categorical var?

Answer 7

nominal n ordinal

Question 8

nominal scale?

Answer 8

var classified into distinct categories
no ranking
weakest measurement

Question 9

ordinal scale

Answer 9

distinct categories
implied ranking
stronger than nominal

Question 10

scale for numerical var?

Answer 10

interval n ratio scale

Question 11

interval scale?

Answer 11

an ordered scale

difference btw measurement not involve a true zero point

Question 12

ratio scale?

Answer 12

an ordered scale

involve a true zero point

Question 13

sources of data?

Answer 13

2 sources: primary & secondary

Question 14

population?

Answer 14

all items/individuals to make conclusions

measured by parameters

Question 15

sample

Answer 15

a portion of population

measured by statistics

Question 16

HMany data formating?

Answer 16

2 formats: structured n unstructured format

Question 17

structured format

Answer 17

a repeating pattern

Question 18

unstructured format

Answer 18

no repeating pattern

Question 19

outliers?

Answer 19

values excessively different

-> not errors but requiring 2nd review

Question 20

mising value?

Answer 20

values cant be collected

Question 21

a recored variable?

Answer 21

var replace original variables

Question 22

one and only one category is called?

Answer 22

mutually exclusive

Question 23

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

Answer 23

collectively exhaustive

Question 24

systematic sample?

Answer 24

k=N/n
k items
N items
n groups