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Date	May 2022	Marks available	1	Reference code	22M.2.HL:.tz0.2
Level	Higher Level	Paper	Paper 2	Time zone	time zone 0
Command term	Identify	Question number	2	Adapted from	N/A

Question

A study investigated the accuracy of a pedometer (a device used to record the number of steps) worn by ten participants during a bench-stepping exercise. Participants were also filmed during each exercise to obtain an accurate reading of steps for comparison with the pedometer data.

The participants performed stepping exercises on benches of 10, 20, and 30 cm height at rates of 40, 60, 80, 100, and 120 steps per minute. Error was calculated by comparing the actual steps taken with the pedometer estimates. The results are summarized in Figure 2.

Figure 2: Error percentage for stepping rate at each bench height

[Source: Ayabe, M., Aoki, J., Ishii, K., Takayama, K., and Tanaka, H., 2008. Pedometer accuracy during stair climbing and bench stepping exercises. Journal of Sports Science and Medicine, 7, pp. 249–254.]

Identify the bench height that has the greatest percentage error at 120 steps per minute.

[1]

Calculate the percentage error difference between the 10 cm bench and the 30 cm bench at 80 steps per minute.

[2]

Markscheme

10 cm

Bench A;

60 – 40;

= 20;

Calculation required for both marks.

Examiners report

This was a positive question for candidates. Many were able to read the graph presented with precision.

Candidates confidently approached this question. Some did not include their working and therefore did not receive full marks. As mentioned with 1aii, calculate questions going forward will only be credited 1 mark for the correct response. However, it is advised that candidates continue to show their workings.

Syllabus sections

Topic 6: Measurement and evaluation of human performance » 6.1. Statistical analysis

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