The shape of a distribution (Edexcel GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
Name the three main types of distribution shapes.
Name the three main types of distribution shapes.
Symmetrical, positively skewed, negatively skewed.
Describe a symmetrical distribution.
Describe a symmetrical distribution.
Balanced around center; equal tails; data evenly spread.
What characterizes a positive skew distribution?
What characterizes a positive skew distribution?
Long tail on the right; most data at lower values.
How does a negative skew distribution look?
How does a negative skew distribution look?
Long tail on the left; most data at higher values.
Where are tails located in a distribution?
Where are tails located in a distribution?
Furthest parts from the center; extend towards extremes.
What does the longer tail in skewed distributions indicate?
What does the longer tail in skewed distributions indicate?
Direction and type of skew; longer tail points to skew.
How are tails key to identifying distribution skew?
How are tails key to identifying distribution skew?
Longer tail's direction determines skew type.
How can you identify skewness from a histogram?
How can you identify skewness from a histogram?
Look for longer tail: right indicates positive, left negative.
What does the shape tell us about data spread?
What does the shape tell us about data spread?
It shows how data values are distributed around the mean.
What is an example of a positively skewed pulse rate distribution?
What is an example of a positively skewed pulse rate distribution?
Most pulse rates in the 80s and 90s; tail extends above 100.