Statistics > QUESTIONS & ANSWERS > Cambridge International AS & A Level MATHEMATICS 9709/62 Paper 6 Probability & Statistics 2 2022 +M (All)
Question Answer Marks Guidance 1(a) 72.3 ± z 64.3 50 M1 Expression of correct form (allow only one side for M1). Must be a z value z = 1.751 B1 Accept 1.75 if nothing better seen CI is 70.3 to... 74.3 metres (3 s.f.) A1 Allow without units Must be an interval 3 1(b) Not random sample B1 Need ‘random’ or ‘not representative/biased because…’ OE 1 [Show More]
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