Steps in Developing a Sample plan 设计一个抽样方案的步骤 Step 7: Execute Step 2: Choose Operational Sampling Data collection Plan Method Step 1: Define the Step 3: Choose Step 6: Develop and Population of Sampling frames Specify Operational Interest Plan Step 5: Determine Step 4: Select a ample size Sampling method
Steps in Developing a Sample Plan 设计一个抽样方案的步骤 Step 1: Define the Population of Interest Step 2: Choose Data Collection Method Step 3: Choose Sampling Frames Step 4: Select a Sampling Method Step 5: Determine Sample Size Step 6: Develop and Specify Operational Plan Step 7: Execute Operational Sampling Plan
Steps in Developing a Sampling Plan (1) Step 1: Defining the Population of Interest Bases for defining the population of interest nclude Geography Demographics ● Awareness
Steps in Developing a Sampling Plan （1） • Step 1: Defining the Population of Interest – Bases for defining the population of interest include: • Geography • Demographics • Use • Awareness
Steps in Developing a Sampling Plan (2) Step 2: Choosing a Data Collection Method The selection of a data collection method has implications for the sampling process Step 3: Choosing a Sampling frame Sampling frame List of population elements from which to select units to be sampled
Steps in Developing a Sampling Plan （2） • Step 2: Choosing a Data Collection Method – The selection of a data collection method has implications for the sampling process. • Step 3: Choosing a Sampling Frame – Sampling frame • List of population elements from which to select units to be sampled
Steps in Developing a Sampling Plan (3) Step 4: Selecting the Sampling Method Probability samples Samples in which every element of the population has a known, nonzero probability of selection. Nonprobability samples Include the selection of specific elements from the population in a nonrandom manner
Steps in Developing a Sampling Plan （3） • Step 4: Selecting the Sampling Method – Probability samples • Samples in which every element of the population has a known, nonzero probability of selection. – Nonprobability samples • Include the selection of specific elements from the population in a nonrandom manner
Steps in Developing a Sampling Plan (4) Step 4: Selecting the Sampling Method (continued Sampling error: The difference between the sample value and the true value of the population mean ↓3L
Steps in Developing a Sampling Plan （4） • Step 4: Selecting the Sampling Method (continued) – Sampling error: The difference between the sample value and the true value of the population mean