Data Flashcards

Covering mean, mode, median, range and scatter graphs

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1
Q

How do you find the MEAN?

A

ADD all the data
DIVIDE by how much data you have

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2
Q

How do you find the MEDIAN?

A

ORDER the data
Cross off in pairs to find the MIDDLE
If you have two middle numbers:
ADD then DIVIDE by 2

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3
Q

How do you find the MODE?

A

MOST common number
(sometimes they use the word MODAL)

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4
Q

How do you find the RANGE?

A

Biggest number SUBTRACT smallest number

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5
Q

If you are asked to comment on:
how CONSISTENT the data is
What do you need to find?

A

RANGE (big - small)
The SMALLER the range the MORE CONSISTENT your data
(Use the word RANGE in your answer)

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6
Q

If you are asked to comment on:
the VARIATION of data
What do you need to find?

A

RANGE (big - small)
The SMALLER the range the LESS variation
(use the word RANGE in your answer)

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7
Q

If you are asked to comment on:
the SPREAD of data
What do you need to find?

A

RANGE (big - small)
The SMALLER the range the LESS spread out your data is
(use the word RANGE in your answer)

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8
Q

If you are asked to find an AVERAGE or to compare AVERAGES. What do you need to find?

A

MEAN and/or MEDIAN

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9
Q

How do you find the MEAN if you have a frequency table?

A

MAD
Multiply
Add
Divide (by amount of data: often found above the table)

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10
Q

How do you ESTIMATE the MEAN from a grouped frequency table?

A

MMAD
Midpoint (add then divide by 2)
Multiply
Add
Divide (by amount of data: often found above the table)

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11
Q

When you see a scatter graph what must you always do?

A

Draw a LINE of BEST FIT

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12
Q

If you have a scatter graph and it asks you to estimate what do you do?

A

Use the LINE of BEST FIT

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13
Q

How do you make a PROBABILITY?

A

Make a FRACTION
(then convert if needed)

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14
Q

How do you find the MIDPOINT of two numbers?

A

ADD them together (press equals!)
DIVIDE by 2

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15
Q

How do you find the PROBABILITY from a PROBABILITY TREE?

A

Follow the path and MULTIPLY

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