Suppose that a group of 1000 orange trees is laid out in 40 rows of 25 trees each. To determine the sugar content of fruit from a sample of 30 trees, researcher A suggests randomly selecting five rows and then randomly selecting six trees from each sampled row. Researcher B suggests numbering each tree on a map of the trees from 1 to 1000 and using random numbers to select 30 of the trees. Which selection method is preferred? Explain.
Answer to relevant QuestionsFor each of the situations described, state whether the sampling procedure is simple random sampling, stratified random sampling, cluster sampling, systematic sampling, or convenience sampling. a. All first-year students at ...The authors of the paper “Illicit Use of Psychostimulants among College Students” (Psychology, Health & Medicine : 283–287) surveyed college students about their use of legal and illegal stimulants. The sample of ...The article “High Levels of Mercury Are Found in Californians” (Los Angeles Times, Feb ru ary 9, 2006) describes a study in which hair samples were tested for mercury. The hair samples were obtained from more than 6000 ...To examine the effect of exercise on body composition, healthy women age 35 to 50 were classified as either active (9 hours or more of physical activity per week) or sedentary (“Effects of Habitual Physical Activity on the ...Explain why blinding is a reasonable strategy in many experiments.
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