A class investigates variation in hand span among students in a school. The class initially measures only members of the school basketball team.
Which change would most improve how well the sample represents the school?
Measure each basketball player’s hand span three more times.
Measure both hands of each of the basketball players.
Select students at random from across the whole school.
Use a ruler with smaller divisions for basketball players.
40 exam-style questions on Edexcel GCSE Biology 3.4 Variation and the Human Genome Project, covering 3.4.1 Causes of variation, 3.4.2 Outcomes of the Human Genome Project, 3.4.3 Genetic variation within a population, and 3.4.4 Effects of genetic mutations on phenotype. Each one has a worked solution and a mark scheme showing where the marks go.