D2 Median and Quartiles Flashcards

1
Q

What does the distance between the lowest and highest value (two ends) represent on a box plot diagram?

A

The range.

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2
Q

How do you get the median value on a cumulative frequency diagram?

A

Total cumulative frequency / 2.

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3
Q

How do you get the lower quartile value on a cumulative frequency diagram?

A

Total cumulative frequency / 4.

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4
Q

How do you get the upper quartile value on a cumulative frequency diagram?

A

Lower quartile cumulative frequency x 3.

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5
Q

How do you get the interquartile range value on a cumulative frequency diagram?

A

Upper quartile - lower quartile.

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6
Q

What summary statistics could you use to compare data sets of box plots?

A
  • the measure of average (median), which one is higher.
  • a measure of either the biggest range or biggest interquartile range.
  • skewness (left hand side of box bigger = negatively skewed, right hand side of box bigger = positively skewed)
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7
Q

What does the box width represent on a box plot?

A

The interquartile range.

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