An agricultural scientist conducted an experiment to investigate the effects of different LED light spectra on the crop yield of tomato plants.
In Group R, 8 tomato plants were grown under a red-enhanced light spectrum.
In Group B, 8 genetically identical tomato plants were grown under a blue-enhanced light spectrum in otherwise identical conditions.
The total tomato yield (in kilograms, kg) harvested from each plant is shown in Table 1 below.
Table 1: Tomato yield per plant (kg)
| Group R (Red-enhanced) | Group B (Blue-enhanced) |
|---|---|
| 4.6 | 3.7 |
| 5.2 | 4.1 |
| 4.8 | 3.4 |
| 5.6 | 4.3 |
| 4.9 | 3.8 |
| 5.1 | 4.1 |
| 5.5 | 3.6 |
| 4.7 | 3.8 |
Calculate the mean yield as the appropriate measure of central tendency for Group R and Group B. Show your calculations for each group.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.