Dr. Aris decided to use the standard deviation as a measure of dispersion for her memory recall data.
Calculate the standard deviation for the number of acoustically similar words recalled correctly shown in Table 3.
You must show your working and give your answer to two decimal places.
Table 3
| Participant | Number of acoustically similar words recalled correctly (xxx) | (x−xˉ)(x - \bar{x})(x−xˉ) | (x−xˉ)2(x - \bar{x})^2(x−xˉ)2 |
|---|---|---|---|
| A | 6 | -0.25 | 0.06 |
| B | 7 | 0.75 | 0.56 |
| C | 5 | -1.25 | 1.56 |
| D | 8 | 1.75 | 3.06 |
| E | 6 | -0.25 | 0.06 |
| F | 5 | -1.25 | 1.56 |
| G | 6 | -0.25 | 0.06 |
| H | 7 | 0.75 | 0.56 |
| Total | 50 | Total | |
| Mean xˉ\bar{x}xˉ | 6.25 |
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.
