A swimming-pool manager is studying the time it takes members to travel to the pool. He waits at the pool entrance in the afternoon and asks the first 28 members who arrive how long their journey was.
State the sampling method the swimming-pool manager used.
State and briefly describe an alternative method of non-random sampling the swimming-pool manager could have used to obtain a sample of 28 members.
23 exam-style questions on Edexcel AS Level Maths Data Collection, covering 1.1 Populations and Samples, 1.2 Sampling, 1.3 Non-Random Sampling, 1.4 Types of Data, and 1.5 The Large Data Set. Each one has a worked solution and a mark scheme showing where the marks go.