Scientists studied the incidence of a disease in a city of 900 000 people. They collected data from 4500 people. Which is the best reason for studying a sample?
A sample of 4500 people gives a more accurate result than testing every person
A sample removes the anomalous results that the whole population would contain
Testing all 900 000 people would take too long a time and cost too much money
A sample makes the data qualitative instead of quantitative, which is easier
179 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.