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Question 139

An educational psychologist investigated whether a new spaced-repetition vocabulary app increases the number of words recalled in a foreign language test. Table 1 shows the vocabulary test scores (out of 20) of 11 students measured before and after using the app for a month.

Table 1: Vocabulary test scores (out of 20) before and after using the vocabulary app

StudentScore beforeScore after
Student A1215
Student B914
Student C1518
Student D1116
Student E1412
Student F813
Student G1010
Student H1317
Student I711
Student J1115
Student K1619

When using a Wilcoxon Signed-Ranks Test to analyze the difference, the calculated value of T T\,T was found to be 5 (T=5T = 5T=5).

Table 2: Critical values of T T\,T for the Wilcoxon Signed-Ranks Test

NNNp≤0.05p \le 0.05p≤0.05 (one-tailed)p≤0.05p \le 0.05p≤0.05 (two-tailed)
985
10108
111311

Using the data in Table 1 and Table 2, explain whether the results are significant at p≤0.05 p \le 0.05\,p≤0.05 for a directional (one-tailed) hypothesis, and if the researcher's directional hypothesis can be accepted.

[3]
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Methods Questions

  1. A Level
  2. /Psychology
  3. /Methods

Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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