Selecting and justifying sampling strategy and population (5 Marks) Case Scenario 1: Selecting Sampling Strategy Stefan worked as a receptionist in a dental surgery with approximately 1500 patients. He wished to find out their attitudes to the new automated appointments scheme. As there was insufficient time and money to collect data from all patients using a questionnaire he decided to send the questionnaire to a sample. The calculation of sample size revealed that to obtain acceptable levels of confidence and accuracy he needed an actual sample size of approximately 300 patients. Using the patient files kept in the filing cabinet as a sampling frame he decided to select his sample systematically. Case Scenario 2: Selecting Sampling Strategy Ceri needed to select a sample of firms to undertake an interview-based survey about the use of photocopiers. As she had limited resources with which to pay for travel and other associated data collection costs, she decided to interview firms in four geographical areas selected from a cluster grouping of local administrative areas. A list of all local administrative areas formed her sampling frame. Each of the local administrative areas (clusters) was given a unique number, the first being 0, the second 1 and so on. The four sample clusters were selected from this sampling frame of local administrative areas using simple random sampling.

Required:

Identify the sampling strategy used in Case 1 and Case 2 and justify your choices based on sampling strategies and target population (or sample frame) used.