In a cognitive psychology experiment investigating working memory, a researcher measures the time taken (in seconds) for participants to complete a complex reasoning task. The researcher calculates that the variance for these completion times is 1.44 s2. What is the standard deviation for this set of data?
0.12 seconds0.12\text{ seconds}0.12 seconds
0.72 seconds0.72\text{ seconds}0.72 seconds
1.20 seconds1.20\text{ seconds}1.20 seconds
2.07 seconds2.07\text{ seconds}2.07 seconds
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.