plugin-Chapter 4 Students

plugin-Chapter 4 Students - Sample Surveys in the Real...

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CHAPTER 4 Sample Surveys in the Real World
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HOW SAMPLING CAN GO WRONG Statistical theory is a nice thing to talk about, but since humans are involved, chances are good that our samples will not always be executed perfectly. We made confidence statements to help us estimate the population parameter. HOWEVER, confidence statements do not reflect all of the sources of error that are present in the real world.
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ERRORS IN SAMPLING We come across two categories of errors when conducting a survey: Sampling errors are errors caused by the act of taking a sample. They would be completely avoided if we took a census. Random sampling error Biased sampling methods Undercoverage Nonsampling errors are errors not related to the act of selecting a sample from the population. They can be present even in a census.
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Random sampling error is the deviation between the sample statistic and the population parameter caused by chance in selecting a random sample. This simply refers to the variability of our statistic. This is unavoidable when taking a sample.
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plugin-Chapter 4 Students - Sample Surveys in the Real...

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