GCSE BIOLOGY Higher Tier Paper 2H. Predictor paper AQA paper. 100% probability of testing
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Course
Biology
Institution
Biology
Three students measured their reaction times.
The students used a computer program.
Figure 1 shows the image displayed on the computer screen.
Figure 1
Wait
This is the method used:
1. Sit facing the computer screen.
2. Click the mouse button as quickly as possible when the computer screen
...
Specimen 2018 (set 2) Time allowed: 1 hour 45 minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler
• a scientific calculator. 1
2
Instructions
3
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 4
• Answer all questions in the spaces provided. 5
• Do all rough work in this book. Cross through any work you do not want
6
to be marked.
• In all calculations, show clearly how you work out your answer. 7
8
Information
9
• The maximum mark for this paper is 100.
• The marks for questions are shown in brackets. TOTAL
• You are expected to use a calculator where appropriate.
• You are reminded of the need for good English and clear presentation
in your answers.
SPECIMEN MATERIAL IB/M/SAMs2/E2 8461/2H
, Do not write
2 outside the
box
0 1 Three students measured their reaction times.
The students used a computer program.
Figure 1 shows the image displayed on the computer screen.
Figure 1
Wait for green
Wait
This is the method used:
1. Sit facing the computer screen.
2. Click the mouse button as quickly as possible when the computer screen
turns green.
3. Record the time taken as shown on the computer screen.
4. Repeat steps 2 and 3 a further 9 times.
SPECIMEN MATERIAL IB/M/SAMs2/8461/2H
, Do not write
3 outside the
box
Table 1 shows the students’ results.
Table 1
Time in milliseconds
Attempt
number
Student A Student B Student C
1 275 260 272
2 259 268 268
3 251 251 275
4 261 256 266
5 260 244 270
6 263 280 283
7 259 468 274
8 256 258 278
9 255 255 286
10 248 277 275
Mean 259 282 275
(1 second = 1000 milliseconds)
0 1 . 1 Suggest why measuring reaction time with a computer is more accurate than
measuring reaction time with a stopwatch.
[1 mark]
Question 1 continues on the next page
Turn over ►
SPECIMEN MATERIAL IB/M/SAMs2/8461/2H
, Do not write
4 outside the
box
0 1 . 2 The students measured 10 reaction times for each person rather than
3 reaction times.
Explain why.
[2 marks]
0 1 . 3 Explain why the mean for student B has been calculated incorrectly.
Use information from Table 1.
[2 marks]
0 1 . 4 Calculate the ratio of student C’s mean reaction time to student A’s mean
reaction time.
Give your answer to 3 significant figures.
[2 marks]
Ratio student C : student A = :1
SPECIMEN MATERIAL IB/M/SAMs2/8461/2H
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