Maths Unit 3

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What does a stem and leaf diagram do?
It compares two sets of results, the left hand side is read backwards
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What is a frequency polygon?
A graph made by joining the midpoints of the tops of the bars in a bar chart with straight lines
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What is the modal class?
The group with the highest frequency in the graph
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How do you estimate the mean from a grouped frequency table?
Add the products of the midpoints and their frequency and then divide it by the total frequency
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When is (n+1)/2 used?
When trying to find the median and the total frequency is n
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What does a scatter diagram tell?
It says whether there is a link between two variables
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What is a line of best fit?
A line that passes as close as possible to the points on a scatter graph
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What is interpolation?
Using a line of best fit to predict data values within the range of data given
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What is extrapolation?
Using a line of best fit to predict data values outside the range of data given
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What are outliers?
Anomalies ( Points that don't match the pattern of the rest of the graph )
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Other cards in this set

Card 2

Front

A graph made by joining the midpoints of the tops of the bars in a bar chart with straight lines

Back

What is a frequency polygon?

Card 3

Front

The group with the highest frequency in the graph

Back

Preview of the back of card 3

Card 4

Front

Add the products of the midpoints and their frequency and then divide it by the total frequency

Back

Preview of the back of card 4

Card 5

Front

When trying to find the median and the total frequency is n

Back

Preview of the back of card 5
View more cards

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