A marine biologist is investigating the relationship between sea surface salinity levels (measured in practical salinity units, PSU) and the population density of a particular zooplankton species (measured in individuals per cubic meter, ind/m3\text{ind/m}^3ind/m3). The biologist collected daily water samples from 35 different coastal locations over a one-month period.
The biologist's hypothesis predicted a significant positive correlation.
Using the information above, explain what the biologist was expecting the results to show.
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.