Statistics- Representations of data (3)

Question 1

Outlier

Answer 1

An extreme value that lies outside the overall data pattern.

Greater than Q₃ : Q₃ + k(Q₃ - Q₁)
Less than Q₁ : Q₁ - k(Q₃ - Q₁)

Question 2

Cleaning the data

Answer 2

Removing anomalies from a data set

Question 3

What does&raquo_space; mean?

Answer 3

Much greater than

Question 4

Box plots

Answer 4

Used to show important features of the data:

• Quartiles
• Max and min points
• Outliers

Question 5

Cumulative frequency graph

Answer 5

Used to plot grouped frequency tables and find estimates for median, quartiles and percentiles.
-plot upper class boundary and cumulative frequency

Question 6

Histograms

Answer 6

Used to represent grouped continuous data

Question 7

What is the area of a histogram bar proportional to?

Answer 7

The frequency in each class

Question 8

Histogram- area of bar equation

Answer 8

area of bar=k*frequency

Question 9

Histogram- frequency density

Answer 9

frequency density=frequency/ class width

Question 10

When comparing data you should comment on…

Answer 10

• a measure of location

- a measure of spread

Question 11

Which measures of location and spread pair?

Answer 11

• Mean and standard deviation

- Median and IQR

Question 12

How do you make a frequency polygon?

Answer 12

Join the middle of the top of each bar on a histogram