Researchers wanted to explore the relationship between adolescents' weekly screen time and their levels of social anxiety.
The researchers obtained informed consent for 75 teenagers aged 13–15 to participate. They asked participants to log their weekly screen time (excluding school work) over a two-week period.
Subsequently, the researchers assessed the teenagers' social anxiety levels using a standardised scale (where higher scores indicate greater social anxiety).
The researchers found that weekly screen time was positively associated with social anxiety scores. Table 1 shows the data collected from a sample of 9 of these participants.
| Participant | Social anxiety score | Weekly screen time (hours) |
|---|---|---|
| A | 24 | 15 |
| B | 18 | 10 |
| C | 30 | 22 |
| D | 22 | 12 |
| E | 26 | 18 |
| F | 32 | 25 |
| G | 25 | 16 |
| H | 20 | 11 |
| I | 28 | 20 |
Calculate the standard deviation for the social anxiety score using the data in Table 1. Show your working and give your answer to two decimal places.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.