Cognitive psychology Practical investigation

Worked examples (9)

• 1Write the null hypothesis (2 marks)
• 2Choose directional or non-directional, and justify it (3 marks)
• 3Operationalise the IV and the DV (4 marks)
• 4Justify the repeated measures design (4 marks)
• 5Describe one control and explain its purpose (3 marks)
• 6Explain how counterbalancing was used (4 marks)
• 7Handle the consent versus demand characteristics tension (5 marks)
• 8Suggest one improvement and justify it (4 marks)
• 9Plan an 8-mark answer on the practical (8 marks)

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Worked examples (9)

• 1Identify and justify the sampling technique (3 marks)
• 2Explain what a biased sample does and does not threaten (4 marks)
• 3Explain how the two word lists were matched (4 marks)
• 4Explain the purpose of a pilot study (4 marks)
• 5Justify the choice of statistical test (3 marks)
• 6Explain why interval data can use an ordinal test (3 marks)
• 7Justify the significance level (4 marks)
• 8Suggest a specific improvement (4 marks)
• 9Plan an 8-mark answer on design decisions (8 marks)

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Worked examples (9)

• 1Calculate the mean and median (3 marks)
• 2Calculate the standard deviation (4 marks)
• 3Justify the choice of measure (3 marks)
• 4Detect skew from the mean and median (3 marks)
• 5Choose and justify the graph (3 marks)
• 6Identify the faults in a graph (4 marks)
• 7Comment on the data (4 marks)
• 8Compare the range with the standard deviation (4 marks)
• 9Plan a 6-mark data analysis answer (6 marks)

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Worked examples (9)

• 1Find N correctly (2 marks)
• 2Rank the differences, including ties (4 marks)
• 3Calculate T (3 marks)
• 4Read the critical value from the table (3 marks)
• 5State the outcome of the test (3 marks)
• 6Decide whether to report a stricter level (4 marks)
• 7Apply Type I and Type II errors to the result (4 marks)
• 8Explain what a significant result does not establish (4 marks)
• 9Run a complete Wilcoxon from raw data (6 marks)

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Worked examples (9)

• 1Give one strength, developed (3 marks)
• 2Give one weakness, developed (3 marks)
• 3Identify what each criticism threatens (4 marks)
• 4Choose the best improvement and justify the choice (4 marks)
• 5Explain why order effects remain a weakness (4 marks)
• 6Defend the low ecological validity (4 marks)
• 7Assess demand characteristics in this practical (4 marks)
• 8Use your own data as evaluative evidence (4 marks)
• 9Plan an 8-mark evaluation of the practical (8 marks)

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