Maths S1

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How do you find a class bound?
It is the midpoint between classes
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What is the mode?
The thing that happens most often
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What is and independent variable?
a variable that is independent of other variables
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what is the median
the middle value of ordered data
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what is a mathematical model
a simplification of a real world problem
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how do you combine two means?
(n1 x mean of X1+n2 x mean of X2) / n1+n2
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what is a dependant variable?
A variable that is dependant of other variables
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What do you use to find the mean in grouped data?
The midpoint
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What is a variable that can have any value
continuous
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what is the formula for r in terms of correlation?
sxy/squrt(ssx x sxy)
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what does var(x) stand for and how is it calculated
variance of x var(x) = E(X^2)-(E(X))^2
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What is the probability addition rule?
P(AUB)=P(A)+P(B)-P(AnB)
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What does Sxx =?
total(x^2)-(total x)^2/n
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how do you find the standard deviation
squrt(variance)
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what does Sxy =
totalxy - (totalx*totaly)/n
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what does Syy =?
totaly^2-(totaly)^2/n
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Other cards in this set

Card 2

Front

What is the mode?

Back

The thing that happens most often

Card 3

Front

What is and independent variable?

Back

Preview of the front of card 3

Card 4

Front

what is the median

Back

Preview of the front of card 4

Card 5

Front

what is a mathematical model

Back

Preview of the front of card 5
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