Paper Reference(s) 6684

Edexcel GCE

Statistics S2 Advanced/Advanced Subsidiary Wednesday 23 June 2004 ( Morning Time: 1 hour 30 minutes

Materials required for examination Items included with question papers Answer Book (AB16) Nil Graph Paper (ASG2) Mathematical Formulae (Lilac)

Candidates may use any calculator EXCEPT those with the facility for symbolic algebra, differentiation and/or integration. Thus candidates may NOT use calculators such as the Texas Instruments TI 89, TI 92, Casio CFX 9970G, Hewlett Packard HP 48G.

Instructions to Candidates
In the boxes on the answer book, write the name of the examining body (Edexcel), your centre number, candidate number, the unit title (Statistics S2), the paper reference (6684), your surname, other name and signature.
Values from the statistical tables should be quoted in full. When a calculator is used, the answer should be given to an appropriate degree of accuracy.

Information for Candidates
A booklet ‘Mathematical Formulae and Statistical Tables’ is provided.
Full marks may be obtained for answers to ALL questions.
This paper has seven questions.

Advice to Candidates
You must ensure that your answers to parts of questions are clearly labelled.
You must show sufficient working to make your methods clear to the Examiner. Answers without working may gain no credit.
1. Explain briefly what you understand by

(a) a sampling frame,
(1)
(b) a statistic.
(2)

2. The continuous random variable X is uniformly distributed over the interval [–1, 4].

Find

(a) P(X < 2.7),
(1)
(b) E(X),
(2)
(c) Var (X).
(2)

3. Brad planted 25 seeds in his greenhouse. He has read in a gardening book that the probability of one of these seeds