Ch.3 Representations of data

Question 1

what is the formula for an outlier?

Answer 1

a value greater than Q³ + k(Q³ - Q¹)

or

a value less than Q¹ - k(Q³ - Q1)

Question 2

how would you work out if something is an outlier?

Answer 2

if the value is greater than the upper quartile plus (k times IQR) or lesser than the lower quartile minus (k times IQR)

Question 3

what is an outlier?

Answer 3

an extreme value

Question 4

what is the sign for much lesser than?

Answer 4

«

Question 5

what is the sign for much greater than?

Answer 5

> >

Question 6

what is an anomaly?

Answer 6

a clearly extreme outlier

Question 7

what is the process of removing anomalies from a data set called?

Answer 7

cleaning the data

Question 8

how is an outlier plotted on a box plot?

Answer 8

as an x on the spot

Question 9

how would you calculate the height of each bar (frequency density) in a histogram?

Answer 9

area of bar = k x frequency

Question 10

how is a frequency polygon made?

Answer 10

joining the middle of the top of each bar of a histogram

Question 11

when comparing data sets what can you comment on?

Answer 11

a measure of location: median and IQR

or

a measure of spread: mean and standard deviation