For each example below, identify the sampling plan. Sampling Method Simple Strat

Question

For each example below, identify the sampling plan. Sampling Method Simple Stratified Cluster Random Random Sampling Sampling Sampling Example 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 number, and the first 100 customers in the ordered array are included in the sample. The methodology for the Kauffman Firm Survey is to divide new businesses into six groups: high tech, female-owned; high tech, male-owned; medium tech, female-owned; medium tech, male-owned; low tech, female-owned; and low tech, male-owned. A simple random sample is taken from each group, and data are collected on each new business in the sample. In a nationwide study of mobile phone usage by incoming university first-year students, 30 universities are randomly selected. Every incoming first-year student at the 30 universities completes a survey on mobile phone usage.

Explanation / Answer

Lawn care firm survey - Simple random sampling (Samples are selected randomly using the random number generator function of excel) Kauffman firm survey - Stratified random sampling (Sample space is divided into different strata and samples are randomly chosen from all of these strata) Nationwide study of mobile phones - Cluster sampling (A cluster of 30 universties are made and all students in these cluster are surveyed, which is called cluster sampling)

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