Dr. Mercer decided to use the standard deviation as a measure of dispersion for her memory recall data.
Calculate the standard deviation for the number of schema-consistent items recalled correctly shown in Table 3.
You must show your working and give your answer to two decimal places.
Table 3
| Participant | Number of schema-consistent items recalled (xxx) | (x−xˉ)(x - \bar{x})(x−xˉ) | (x−xˉ)2(x - \bar{x})^2(x−xˉ)2 |
|---|---|---|---|
| A | 4 | -1.50 | 2.25 |
| B | 7 | 1.50 | 2.25 |
| C | 5 | -0.50 | 0.25 |
| D | 6 | 0.50 | 0.25 |
| E | 3 | -2.50 | 6.25 |
| F | 8 | 2.50 | 6.25 |
| G | 5 | -0.50 | 0.25 |
| H | 6 | 0.50 | 0.25 |
| Total | 44 | Total | |
| Mean xˉ\bar{x}xˉ | 5.50 |
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, 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.
