Inferential testing (A-level only)

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Question 69

Scenario

A team of cognitive psychologists investigated the effect of auditory environment on attention during a proofreading task.

Participants completed two similar proofreading trials under different conditions:

Condition X: listening to loud ambient cafe noise.
Condition Y: listening to classical music.

The psychologists measured:

the number of typographical errors correctly identified (out of 50).
the time taken to complete the passage, in minutes.

The study used a repeated measures design where the same 15 participants completed both conditions, with the order of conditions counterbalanced.

The mean scores for each of these measures are shown in Table 1.

Table 1: Table showing the mean number of errors identified and mean completion times in minutes for Condition X and Condition Y

Mean scores	Condition X: Cafe Noise	Condition Y: Classical Music
Mean number of errors identified	18.4	24.6
Mean completion time (minutes)	12.5	9.2

Question

Identify an appropriate non-parametric statistical test to analyse the difference in the number of typographical errors identified in the two conditions of this study. Explain why this test of difference would be appropriate.

[3]

Inferential testing (A-level only)

Question 69

Scenario

A team of cognitive psychologists investigated the effect of auditory environment on attention during a proofreading task.

Participants completed two similar proofreading trials under different conditions:

Condition X: listening to loud ambient cafe noise.
Condition Y: listening to classical music.

The psychologists measured:

the number of typographical errors correctly identified (out of 50).
the time taken to complete the passage, in minutes.

The study used a repeated measures design where the same 15 participants completed both conditions, with the order of conditions counterbalanced.

The mean scores for each of these measures are shown in Table 1.

Table 1: Table showing the mean number of errors identified and mean completion times in minutes for Condition X and Condition Y

Mean scores	Condition X: Cafe Noise	Condition Y: Classical Music
Mean number of errors identified	18.4	24.6
Mean completion time (minutes)	12.5	9.2

Question

[3]

Inferential testing (A-level only)

Question 69

Scenario

Table 1: Table showing the mean number of errors identified and mean completion times in minutes for Condition X and Condition Y

Question

Inferential testing (A-level only) Questions

Inferential testing (A-level only)

Question 69

Scenario

Table 1: Table showing the mean number of errors identified and mean completion times in minutes for Condition X and Condition Y

Question

Inferential testing (A-level only) Questions