A climatologist is conducting a study to determine the effect of reforestation on local summer maximum temperatures in a semi-arid region. Extensive climate simulations and historical data from similar regions consistently show that increased tree cover reduces local temperatures through evapotranspiration.
State whether the hypothesis for this study should be directional or non-directional, and explain your answer.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.