An occupational psychologist investigated the effect of a new flexible working policy on employee sleep patterns. They recorded the change in average nightly sleep duration (in hours) for six employees over a month. A positive value indicates an increase in sleep, while a negative value indicates a decrease. The recorded changes were:
+2.8,−1.5,+0.4,−3.2,+1.9,−0.7 +2.8, \quad -1.5, \quad +0.4, \quad -3.2, \quad +1.9, \quad -0.7 +2.8,−1.5,+0.4,−3.2,+1.9,−0.7What is the range for this set of data?
2.42.42.4
4.34.34.3
6.06.06.0
0.40.40.4
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.