HKDSE Integrated Science Report on the 2013 Examination

Ms Grace Yau Manager, HKEAA

5**

6 Nov 2013

On Question Setting ` Integrating different modules

` Testing a range of ` skills ` abilities

` Balance in coverage of different compulsory modules

Processes in Question Paper development ` Setting ` Moderating ` Language polishing ` Assessing (by assessors) ` Proofreading ` Printing

Marking ` On-screen marking

Panel Paper 1 Paper 2B

1 Qs. 3, 6, & 11 Q.1 [E1]

2 Qs. 2, 7, 8 & 9 Q.2 [E2]

3 Qs. 1, 4, 5 & 10 Q.3 [E3]

` Markers’ meeting – standardisation of marking ` Training scripts, qualifying scripts & control scripts – for

monitoring marking standard ` Checkmarking by Chief and Assisstant Examiners ` Equating applied to Q.1 to Q.3 in Paper 2 Section B

Moderation of SBA marks

` SBA marks statistically moderated with both Mean and SD adjusted (outlining cases reviewed by the Supervisor)

Grading

` Expert Panel (Chief Examiner, Assistant Examiner, experienced markers) to determine level boundaries/cut scores by making reference to ` Level descriptors ` Group Ability Indicator (GAI) ` Viewing candidate samples

` Endorsement by Senior Management/Exam Board

Overview of 2013 Exam Candidature = 331 [ E = 120 ; C = 211 ]

Mean % subject mark Mean of Paper 1 (Questions on C1 to C8) ~ 43% 45

Mean of Paper 2A (32 MCQs on C1 to C8)

~ 52% [17 out of 32 Qs]

15

Mean of Paper 2B (2 out of 3 Qs; on E1 to E3)

Mean of SBA Area A : Skills in performing

experiments Area B : Report writing

Subject Mean

~ 42%

~ 67%

~ 49%

20

20

100

Results

Feedback to teachers ` Examination Report & Question Papers

1. Question Papers 2. Marking Scheme (with General Marking Guidelines) 3. Reports on Candidates’ Performance

` Exemplars and Comments for each Level ` For (E) Exemplars & Comments` http://www.hkeaa.edu.hk/en/HKDSE/Subject_Information/NSS/int_sci/sp/2013.ht

ml ` For (C) Exemplars & Comments ` http://www.hkeaa.edu.hk/tc/HKDSE/Subject_Information/NSS/int_sci/sp/2013.ht

ml ` Typical performance at each level with brief comments

` Briefing Session

Candidates’ performance in Paper 2 Section A

Paper 2 Section A

` No. of items deleted = 0 ` Mean = 52% [17 out of 32 Qs] ` Range = 4 – 29 ` Highest % correct = 77% (Q.1) ` Lowest % correct = 28% (Q.31)

% correct > 70 40 – 70 < 40

No. of items 4 23 5

Easy

Difficult

Q.4

` Testing knowledge of the change in density of water when it is cooled

` 70% candidates understand that the density of water increases as the temperature drops

` 37% candidates realised that water has the highest density at 4°C.

Q.9

` Resolve the reactions acting on the athlete ` Compare the magnitude of the horizontal components of these forces ` Weak at determining the magnitude of the horizontal component from the data provided

Q.19 ` first apply the right hand

grip rule to find the direction of the magnetic field around wire Y due to currents flowing in wire X and wire Z

` work out the direction of the force acting on wire Y using Fleming’s left hand rule

` 24% might have stopped at the first step

Æ option D

` 22% seemed to have erroneously used the right hand in determining the direction of the force acting on wire Y

Æ option B

Q.26

` Quite a number of candidates misconstrued that destructive interference would occur when the troughs produced by S1 meet the troughs produced by S2 and erroneously chose option B. In fact, when the two troughs meet at point Q, they reinforce each other to form a larger trough.

Q.31

` To find out the amino acid that is absent Æ identify the genetic code that hadundergone mutation (i.e. from ‘GTA’ to ‘CTA’ in the mutated gene P.)

` Many mistook the coding strand as the template to work out the mRNA codon ‘CAU [option A]

` Some overlooked the requirement of the question and erroneously chose the amino acid produced by the mutation (i.e. leucine).

Paper 2 Section B Q.1 (E1) Q.2 (E2) Q.3 (E3)

Popularity

E+C 48% 95% 55%

C 62% 93% 41%

E 24% 97% 79%

Mark range 0-15 0 - 16 0 -16

Maximum mark (20 marks) E3 > E2 E2 > E1

Mean mark difference 1 0.6

% mark difference 5% 3%

THANK YOU !