IGCSE-Statistics 统计学03900390_s05_er.pdfVIP

0390 Mathematics: Statistics (Half Credit) June 2005 CONTENTS FOREWORD 1 MATHEMATICS: STATISTICS (HALF CREDIT) 2 Paper 0390/06 Paper 6 2 FOREWORD This booklet contains reports written by Examiners on the work of candidates in certain papers. Its contents are primarily for the information of the subject teachers concerned. 1 0390 Mathematics: Statistics (Half Credit) June 2005 MATHEMATICS: STATISTICS (HALF CREDIT) Paper 0390/06 Paper 6 General comments This paper produced a wide range of marks. Whilst most candidates were able to attempt all the questions, there were some Centres who entered candidates who had clearly not covered the syllabus and who failed to reach the required standard. Most candidates answered questions to a suitable degree of accuracy, and it was pleasing to observe that only a few lost marks due to premature approximation. This occurred mainly in the use of normal tables. Candidates seemed to have sufficient time to answer all the questions, and only the weaker ones answered questions out of order. Comments on specific questions Question 1 This was well attempted by most of the candidates who had covered the syllabus. Nearly everyone recognised the normal approximation to the binomial and a pleasing number applied the continuity correction with almost all who did so getting it in the correct direction. As in previous years, many lost marks by finding the wrong area. Answer : 0.677. Question 2 This straightforward question on the mean and standard deviation of grouped frequencies produced many correct answers but some candidates provided answers which did not use the mid-point of the frequencies. The upper end, the lower end, the class width, and the semi-class width were all used. The mark s