# Maths Semester 1

What is a scalar quantity?
Something which only takes into account magnitude and not direction
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What is the formula to work out max walking speed?
square root of l x g
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How would you work out a percentage increase?
Divide the increase by the original number and multiply by 100
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What is the quadratic formula?
x= -b+/- square root of b squared -4ac all over 2a
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What is the sine rule?
sin (angle)= opposite/hypotenuse
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How do you draw a bearing?
From north working clockwise
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How would you work out the resultant velocity of a swimmer taking into account their velocity and that of the current working perpendicular to them?
Using tip to tail method draw a triangle with one of the sides labelled as R, use Pythagoras to work out the length of R.
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Taking into account the current on the swimmer how would you work out how much further the swimmer had to travel?
Use trig to work out the angle created by drawing a triangle using the tip to tail method
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What do you use to work out the horizontal component of initial velocity?
uCOS(angle)
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What do you use to work out the vertical component of initial velocity?
uSIN(angle)
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What SUVAT equations could you use to work out displacement?
s=ut+1/2at(squared). V(squared)=u(squared)+2as. s=ut-1/2gt(squared). V(squared)= U(squared)-2gs
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What is the first SUVAT equation?
V=u+at
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What is the second SUVAT equation?
s=ut+1/2at(squared)
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What is the 3rd SUVAT equation?
V(squared)=u(squared)+2as
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What is the 4th SUVAT equation?
V=u-gt
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What is the 5th suva equation?
s=ut-1/2gt(squared)
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What is the 6th SUVAT equation?
V(squared)=u(squared)-2gs
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What is a radian?
The angle in the centre of a circle
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How many degrees is 1 radian?
57.3
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How do you work out a radian in a circle?
s/r (s=arc length)
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How do you convert degrees to radians?
Degrees X pi / 180
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How do you convert radians to degrees?
radians X 180 / pi
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What does central difference mean?
A central value in a probability distribution
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What is probability?
The number of ways an event can occur in a sample space divided by the number of members in a sample space
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How do you work out standard error for a data set?
Standard deviation divided y the square root of the number of data points in the set
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When can you use a parametric test?
When continuous variables have a normal distribution, when spread of groups being tested is different , if the data set is skewed BUT sample size is large
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What is the assumption which goes along with parametric tests?
Data is normally distributed
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What can you do if your data set isn't easily distributed?
Transform the data through logs, square roots and arcsine or use non-parametric tests
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What does the chi squared test compare?
Observed data with expected data
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What is a poisson distribution?
A discrete frequency distribution resulting from events happening randomly
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## Other cards in this set

### Card 2

#### Front

What is the formula to work out max walking speed?

#### Back

square root of l x g

### Card 3

#### Front

How would you work out a percentage increase?

#### Back ### Card 4

#### Front

What is the quadratic formula?

#### Back ### Card 5

#### Front

What is the sine rule?

#### Back 