Comparisons Of Central Tendency Averages Flashcards

1
Q

Mean

A

Takes jn all data values so it can be easily influenced by high or low values , thus susceptible to outliers

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2
Q

Median , mode , midrange

A

Less sensitive to outliers
Median good and decent if values not relative to mean
Mode only used for high frequency data
Midrange is also susbcitbke to outliers don’t use , assumes data symmetrical!!!

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3
Q

Calculating median from frequency table

GROUPED DATA

A

Remember if even frequency it will be an average of both middle values need to remember this

2) IF ITS GROUPED THEN JUST DIVIDE BY 2 DONT ADD ONE

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4
Q

How to compare box plot

A

1) median , higher median means higher average
2) IQ range, shows how much or less spread out data is
3) range

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5
Q

Standard deviation for grouped values ?

A

USE MIDPOINT AS VALUE FOR X THE

= f* x^2 then do the rest

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6
Q

Outliers

A

2 plus minus SX from mean or

1.5 IQR from quartiles

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7
Q

Scatter diagrams IMPORTSNT about correlation

A

Correlation does not imply causation

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8
Q

How to better data

A

Clean it , use different sample techniques with better ways of doing em , better collecting method

Also if straitifying straitify by more regions etc

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9
Q

Remember if they don’t already give class width what you have to do for adjustment?

A

Round it by upper bounds and ADJUST !

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