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GCSE Statistics
chapter 4
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GCSE Statistics
11th
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18 Terms
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1
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a casual relationship is where
there is a reason why something happens
2
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example of a casual relationship is
as the age of something increases its value decreases
3
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with lines of best fit, if you have to plot it through the mean point, it means
find the mean of x and the mean of y and plot that point
4
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interpolation is
within the data and therefore is reliable
5
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extrapolation is
outside the data set and is therefore less reliable than interpolation
6
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line of best fit is also known as
the regression line
7
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equation of a line is
y=mx+c
8
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gradient means that
every time that x increases by 1 the y increases/decreases by m
9
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the y intercept is
the initial thing as it is where x is zero
10
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spearman’s rank tests
how strong or weak the correlation between two things are
11
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the equation for spearmans rank is
\
12
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in spearman’s, a perfect positive or negative correlation is
1 or -1
13
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in spearmans, a strong positive or negative correlation is
0\.8 or above, -0.8 or below
14
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in spearman’s a weak positive or negative correlation is
0\.4 or above, -0.4 or below
15
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in spearman’s you have to rank both x and y
the same way
16
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spearman’s rank is represented as
rs
17
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spearman’s rank is designed for
non-linear correlation
18
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what is more suitable for linear correlation
pearsons product moment correlation
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