Edexcel A Level Maths Stats And Mech Yr 2

Front 1

Define product moment correlation coefficient (PMCC)

Back 1

The product moment correlation coefficient describes the linear correlation between two variables. It can take values between -1 and 1

If r=1 the is perfect posotive linear correlation

If r=-1 there is perfect negative correlation

If r=0 there is no linear correlation

Front 2

When hypothesis testing PMCC where do you look for critical region

Back 2

Table of critical values in the equation booklet

Front 3

What is (A∪B)

Back 3

A Union B so BOTH

Hint 3

A Union B

Front 4

what is A∩B

Back 4

A AND B so only the Middle

Front 5

what is (A')

Back 5

NOT A so amything BUT A

Front 6

what does P(A∪B) =

Back 6

P(A∪B)= P(A) + P(B) - P(A∩B)

Front 7

what does P(B|A) =

Back 7

P(B|A) = P(B∪A)/P(A) ⇒ P(B∩A) = P(B|A) x P(A)

Front 8

what are the features ofna normal distribution

Back 8

1. it Has parameters μ, the population mean... and also σ², the population varience

2. its symmetrical (mean=median=mode)

3. it is a bell shaped curve with asmptopes at each end

4. the total area under the curve is equal to 1

5. has point of inflection at μ + σ and μ - σ

Front 9

what is a point of inflection

Back 9

a point of a curve at which a change in the direction of curvature occurs.

Front 10

what is the standard normal distribution

Back 10

Z ~ N (0,1²)

Front 11

What is the equation used to code the normal distribution

Back 11

Z = X - μ / σ