Representation and summary of data - location

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  • Created by: temi9
  • Created on: 21-04-15 20:56
What are quantitative variables?
(Values associated with) numerical observations
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What are qualitative variables?
(Values associated with) non-numerical observations
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What is a continuous variable?
A variable that can take any value in a given range
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What is a discrete variable?
A variable that can take only specific values in a given range
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Formula for combining means
x= (n'x' + n''x'')/ n' + n''
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Coding form
y= (x-a)/b
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How do you find the median for continuous data?
n/2 and use interpolation to find the value of the corresponding term
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When do we use the mode?
When data is qualitative, or quantitative (either modal or bimodal). Not informative if values occur only once
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When do we use the median?
Used for quantitative data with extreme vales (as it is unaffected by them)
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When do we use the mean?
Used for quanititative data and uses all data. Gives a true measure of data, but affected by extreme values
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Other cards in this set

Card 2

Front

What are qualitative variables?

Back

(Values associated with) non-numerical observations

Card 3

Front

What is a continuous variable?

Back

Preview of the front of card 3

Card 4

Front

What is a discrete variable?

Back

Preview of the front of card 4

Card 5

Front

Formula for combining means

Back

Preview of the front of card 5
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