The sampling frame is a list, map, or other specification of sampling units in the population from which a sample may be selected. Clubine's (2011) sampling frame consisted of registry lists available from the National Gardening Association and Rainwater Educational Alliance for Learning. Defining the target population is an important and often difficult part of the study. The target population is defined as the complete collection of observations the researcher wants to study. Figure 1.1 summarizes the difference between sampling frame (green and black boxes), target population (blue box), and sampled population (black box). Use Figure 1.1. to carefully describe Clubine's (2011) target population. Make sure you explain the difference among Clubine's target population, sampling frame, and the ultimate population that was sampled

TARGET POPULATION SAMPLING FRAME Not reachable Not included in Refuse to SAMPLED Not eligible sampling frame respond POPULATION For survey Not capable of responding