A librarian is studying the time it takes students at her college to travel to the library. She stands at the library entrance after college and asks the first 36 students who arrive how long their journey was.
State the sampling method the librarian used.
State and briefly describe an alternative method of non-random sampling the librarian could have used to obtain a sample of 36 students.
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.