EDEXCEL AS LEVEL MATHS 2025 PAPER 2 STATISTICS QP AND MARKSCHEME [VERIFIED]

EDEXCEL AS LEVEL MATHS 2025 PAPER 2 STATISTICS QP AND
MARKSCHEME [VERIFIED]


Linear Regression

Ans>>
Y = Axⁿ

Logy = Loga + Nlogx




Exponential Regression

Ans>>
Y = Ab^X

Logy = Loga + Xlogb




Normal Approximation

Ans>>
µ = Np

Σ =√(Np(1-P))




Mean

Ans>>
∑X ÷ N

,Gf: ∑Xf ÷ ∑F

Variance

Ans>> (∑X²/N) - (∑X/N)²




Standard Deviation

Ans>> √Variance



Histograms: Height

Ans>> Area = K X Frequency




Frequency Density

Ans>> Frequency ÷ Class Width




Population

Ans>> Whole Set Of Items Of Interest.



Census

Ans>> Observes/Measures Every Member Of A Population


Sample

,Ans>> Selection Of Observations Taken From A Subset Of The Population Which Is Used To Find Out
Info About The Population.

Sampling Frame

Ans>> A List Of Individuals (Named Or Numbered) From Whom The Sample Is Drawn



Random Sampling

Ans>> Every Member Of The Population Has An Equal Chance Of Being Selected




Systematic Sampling

Ans>> Every Nth Person Is Chosen.




Stratified Sampling

Ans>> Population Is Divided Into Mutually Exclusive Strat And A Random Sample Is Taken From Each.



Quota Sampling

Ans>> Interviewer Selects A Sample That Reflects The Characteristics Of The Population




Opportunity Sampling

Ans>> Choosing Whoever Is Available

, Continuous Variable

Ans>> Can Take Any Value In A Given Range
Discrete Variable

Ans>> Takes Specific Values In A Given Range




Conditions For Binomial

Ans>>
Fixed No. Of Trials

2 Possible Outcomes

Outcomes Are Independent

Fixed Probability Of Success




Probability: Independent If...

Ans>>
P(A∩B) = P(A) X P(B)

P(A|B) = P(A)




Probability: Mutually Exclusive If...

Ans>>
P(A∩B) = 0

P(A∪B) = P(A) + P(B)