Unit 1

Question 1

individuals

Answer 1

an object (what the data is about)

Question 2

variables

Answer 2

what about the individual; more info

Question 3

categorical variables

Answer 3

assigns individuals in a group

Question 4

quantitative variables

Answer 4

number values or measurements

Question 5

2 types of quantitative variables

Answer 5

discrete and continuous

Question 6

discrete variable

Answer 6

fixed set of possible values
no decimals
book pages & shoe sizes

Question 7

continuous variable

Answer 7

any # in an interval
e.g. length of film, temperature, time to run a race, weight, gas mileage

Question 8

marginal relative frequency

Answer 8

percents/proportion of individuals that have a specific value/categorical value

Question 9

joint relative frequency

Answer 9

percent for 2 specific values in an intersecting 2 way table

Question 10

Answer format for analyzing a graph in full detail

Answer 10

SHAPE: distribution, gaps & peaks
OUTLIERS: specify where
CENTER: median
VARIABILITY: Range

Question 11

roughly symmetric graph

Answer 11

mean=median

Question 12

skewed to the left:

Answer 12

mean<median

Question 13

skewed to the right:

Answer 13

mean> median

Question 14

is mean and s.d. resistant

Answer 14

NO

Question 15

is median resistant

Answer 15

YES

Question 16

why are box & whiskers inconvenient

Answer 16

do not display invidvidual value; doesn’t show gaps, clusters & peaks

Question 17

IQR rule

Answer 17

low outliers < Q1-1.5(IQR)
High outliers > Q3 +1.5(IQR)