For each of the following examples, identify the sampling method. In a nationwid

Question

For each of the following examples, identify the sampling method. In a nationwide study of cell phone usage by incoming college freshmen, 30 colleges are randomly selected. Every incoming freshman at the 30 colleges completes a survey on cell phone usage. A customer arriving at a bank's drive-through window is randomly selected. Then every fifth customer using the drive-through after the first one is included in the sample until the desired sample size is attained. The National Road Freight Survey, conducted by the European Union, divides commercial vehicles into three groups based on their weights: 2-5 tons, 5-10 tons, and over 10 tons. A simple random sample is taken from each group, and data are collected on each vehicle in the sample. A lawn care firm surveys a sample of its customers on their levels of satisfaction with the firm. Each client in the firm's database is assigned a random number using Excel's random number generator. The clients are sorted in ascending order based on their random numbers, and the first 100 customers in the ordered

Explanation / Answer

1 ) In a nationwide study of cell phone usage by incoming college freshmen , 30 colleges are randomly selected . Every incoming freshman at the 30 colleges completes a survey on cell phone usage .

------------------------------- Cluster sampling .

2 ) A customer arriving at a bank's drive-throw window is randomly selected . Then every fifth customer using the drive-through after the first one is included in the sample until the desired sample size is attained

------------------------- Systematic sampling

3 ) The National Road Freight Survey , conducted by the European Union , divides commercial vehicles into three groups based on their weights : 2-5 tons , 5-10 tons , and over 10 tons . A simple random sample is taken from each group , and data are collected on each vehicle in the sample .

------------------------------- Stratified random sampling

4 ) A lawn care firm surveys a sample of its customers on their level of satisfaction with the firm . Each client in the firm's database is assigned a random number using Excel's random number generator . The clients are sorted in ascending order based on their random numbers , and the first 100 customers in the ordered array are included in the sample .

--------------------------- Simple random sampling .

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