Statistics

Question 1

What is discrete data ?

Can you give some examples?

Answer 1

Data that is whole numbers and cannot be split up

Shoe size
Number of something

Question 2

What is continuous data and can you give some examples?

Answer 2

Measurements at all points including decimals

Height (150.7cm)
Distance

Question 3

What is class width ?

Answer 3

The difference between the lower and upper class boundary

Question 4

What is the midpoint of the class ?

Answer 4

Middle between beginning and end of class

Question 5

How do you work out IQR ?

Answer 5

IQR=UQ-LQ

Question 6

What do the question for frequency density ?

Answer 6

Frequency divided by class width

Question 7

How do you work out frequency ?

Answer 7

Frequency density X class width

Question 8

On a histogram what goes up the side and what goes along the bottom ?

Answer 8

Bottom = class width 
Up the side = frequency density 

Each bar represents frequency

Question 9

What goes along the bottom and up the side of a cumulative frequency graph ?

Answer 9

Bottom = length/class width
Up the side = cumulative frequency 

The curve should form an “s” shape or be a curve of some degree or go flat at a point

Question 10

What do you discuss when comparing box plots ?

Answer 10

Median
Inter quartile range
Full range between LQ and UQ (bigger range = less consistent)

Question 11

What is a four point moving average ?

Answer 11

You add up four quarters and divide by four and continue along the quarters knocking one off each time