Samples and Surveys

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It's fairly impossible to survey the entire population for their opinions or preferences. Because of this, most people use what is a called a sample, a part of the population being surveyed. They then use the results from the sample to conclude what the population would think, a population being the entire group being considered for a survey.

There are several sampling methods including random, systematic, stratified, convenience, and voluntary response. In today's free 8th Grade Math video, Prof. Burger covers these sampling methods. He also demonstrates how some sampling methods are better than others and how to identify bias in a sampling method.

Look in any newspaper and you'll see how often surveys are utilized to determine population trends. This is great information that will come in handy as you read statistics and news articles discussing results of polls and surveys. You'll not only have a better understanding of how they reached their conclusions, but whether or not to take them seriously due to a sampling error or bias. Just make sure you click the forward button to the left of the time stamp to move to the next lecture on the video. Today's video has 3 lectures that clearly explain the concept of Samples and Surveys.


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This page contains a single entry by April Stockwell published on April 28, 2011 11:54 AM.

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