S1 Flashcards
1
Q
How do you use R to measure correlation
A
r=1 Perfect positive
r=0 No correlation
r=-1 Perfect Negative
2
Q
Is correlation affected by coding
A
No
3
Q
How to work out Sxy
A
Σxy-(ΣxΣy)/n
4
Q
How to work out Syy
A
Σy²- (Σy)²/n
5
Q
Work out Sxx
A
Σx²- (Σx)²/n
6
Q
How do you work out the product moment correlation coeffecient
A
Sxy/√SxxSyy
7
Q
How can you tell if A and B are independant
A
P(AgivenB)=P(A)
8
Q
How can you tell if A and B are mutually exclusive
A
P(AnB)=0
9
Q
What is P(AgivenB)
A
P(AnB)/P(B)
10
Q
What is P(AuB)
A
P(A)+P(B)-P(AnB)
11
Q
What is Standard Deviation
A
√Varience
√(Σx²/n - (Σx/n)²)
12
Q
What is the normal distribution equation
A
Z=(x-μ)/σ
13
Q
What is Variance
A
(Σx²/n - (Σx/n)²)
14
Q
What is the Mean
A
Σx/n
15
Q
How to work out Var(x)
A
E(x²0-[E(x)]²
