Data Flashcards
Covering mean, mode, median, range and scatter graphs
How do you find the MEAN?
ADD all the data
DIVIDE by how much data you have
How do you find the MEDIAN?
ORDER the data
Cross off in pairs to find the MIDDLE
If you have two middle numbers:
ADD then DIVIDE by 2
How do you find the MODE?
MOST common number
(sometimes they use the word MODAL)
How do you find the RANGE?
Biggest number SUBTRACT smallest number
If you are asked to comment on:
how CONSISTENT the data is
What do you need to find?
RANGE (big - small)
The SMALLER the range the MORE CONSISTENT your data
(Use the word RANGE in your answer)
If you are asked to comment on:
the VARIATION of data
What do you need to find?
RANGE (big - small)
The SMALLER the range the LESS variation
(use the word RANGE in your answer)
If you are asked to comment on:
the SPREAD of data
What do you need to find?
RANGE (big - small)
The SMALLER the range the LESS spread out your data is
(use the word RANGE in your answer)
If you are asked to find an AVERAGE or to compare AVERAGES. What do you need to find?
MEAN and/or MEDIAN
How do you find the MEAN if you have a frequency table?
MAD
Multiply
Add
Divide (by amount of data: often found above the table)
How do you ESTIMATE the MEAN from a grouped frequency table?
MMAD
Midpoint (add then divide by 2)
Multiply
Add
Divide (by amount of data: often found above the table)
When you see a scatter graph what must you always do?
Draw a LINE of BEST FIT
If you have a scatter graph and it asks you to estimate what do you do?
Use the LINE of BEST FIT
How do you make a PROBABILITY?
Make a FRACTION
(then convert if needed)
How do you find the MIDPOINT of two numbers?
ADD them together (press equals!)
DIVIDE by 2
How do you find the PROBABILITY from a PROBABILITY TREE?
Follow the path and MULTIPLY
