U3 Psych AOS3 Discussion part of paster

Hypothesis link

The results supported the hypothesis, as the individuals who used chunking, recalled a greater number of digits (mean of 10) than those who were not provided this strategy (mean of 7), indicating that chunking improved short term memory recall and capacity. 

Interpretation of data in relation to hypothesis

The results showed a clear difference between the chunking and non-chunking conditions. Participants in the experimental group recalled a total of 49 digits with a mean score of 10, while participants in the control group recalled a total of 36 digits with a mean score of 7. This indicates that participants exposed to chunked information were able to remember more digits than participants exposed to non-chunked information. The independent variable, whether the digits were chunked or non-chunked, therefore affected the dependent variable, which was the number of correctly recalled digits. Chunking likely improved recall because grouping the digits into meaningful sections reduced the number of separate items participants needed to process in short-term memory. As a result, chunking increased the effective capacity of short-term memory, allowing participants to recall more information accurately.

Linking to psychological background theory

The findings support the Atkinson–Shiffrin Multi-Store Model of Memory, which states that short-term memory has a limited capacity of approximately 5–9 items. Chunking allows information to be grouped into larger, meaningful units, increasing the effective capacity of short-term memory. In this investigation, participants in the chunking condition were able to recall more digits because the information was organised into fewer but larger chunks, reducing cognitive load and improving encoding and retrieval processes within short-term memory.

Linking to past research

The findings of this investigation support research by George A. Miller, Nelson Cowan, and Zhijian Chen, who found that participants recalled more information when chunking strategies were used in working memory tasks. Similarly, participants in this investigation recalled more digits in the chunked condition (mean = 10) than in the non-chunked condition (mean = 7), supporting the conclusion that chunking increases memory capacity by organising information into meaningful units.

The findings also support research by Dennis E. Egan and Harry J. Schwartz, who found that participants recalled information more effectively when it was organised into chunks. Similarly, participants in the current investigation achieved higher recall scores when the digits were grouped into chunks, suggesting that chunking improves short-term memory recall.

Evaluation of method

One possible confounding variable was natural differences in memory ability between participants, as some participants may naturally have stronger short-term memory capacity than others. This could have influenced recall scores independently of chunking, reducing the internal validity of the experiment. Another confounding variable was testing order effects, as the control group was always tested before the experimental group. Participants tested later may have heard information about the task from earlier participants, potentially giving the experimental group an advantage.

A limitation of the sampling method was that only 10 Year 11 students from one school were used, meaning the sample size was small and not representative of the wider population. This reduces external validity because the findings may not generalise to people of different ages or backgrounds. An improvement would be to use a larger and more diverse sample and randomly alternate which group is tested first to reduce order effects and improve validity.

Evaluation of the certainty in data

One factor affecting the certainty of the data was the small sample size of only 10 participants. A small sample increases the impact of individual differences, such as memory ability, motivation, or concentration, making the results less reliable and reducing confidence that the findings accurately represent the wider population. Another factor was that some extraneous variables, such as sleep, stress levels, or prior use of memory strategies, could not be fully controlled and may have influenced recall performance. To improve the certainty and reliability of the data, future research could use a larger sample size, stricter control of extraneous variables, and repeated trials to identify more consistent patterns in the results.

Implications

The findings suggest that chunking can be used as an effective memory strategy to improve short-term memory recall in everyday situations such as studying, learning phone numbers, or remembering instructions. Future research could investigate whether chunking improves recall for different types of information, such as words or images, or examine how chunking affects memory performance in different age groups.

Conclusion

The investigation found that participants presented with chunked digits recalled more digits (mean of 10) than participants presented with non-chunked digits (mean of 7), demonstrating that chunking improved short-term memory recall.