UNIT 6.1 - STATISTICS Flashcards

1
Q

How is SD useful for comparing the means and spread of data between two or more samples?

A

A small SD indicates that the data is clustered closely around the mean. A large SD indicates a wider spread around the mean

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2
Q

What is the statistic used to summarise the spread of values around the mean?

A

about 68% of all values lie within one SD.
95% lie within two SDs of the mean
99.7% lie within 3 SDs of the mean

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3
Q

Coefficient of variation formula

A

V = SD/mean X 100

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4
Q

Benefits of the coefficient of variation?

A

Allows us to compare between different data sets, with different units.
SD only allows us to compare within units

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