STAT 2040 Lecture Notes - Lecture 1: Simple Random Sample, Cluster Sampling, Saturated Fat
3 Mar 2017
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Document Summary
In 1994 the center for science in the public interest (cspi) investigated nutri- tional characteristics of movie theatre popcorn, and found that the popcorn was often loaded with saturated fats. In 2009, the cspi revisited movie theatre popcorn. They found that in addition to the poor stated nutritional characteristics, in reality what was served at theatres actually contained more calories, fat, and saturated fat than was stated by the companies. Suppose that your local movie theatre chain claims that a large untopped bag of their popcorn contains 920 calories on average. You spend a little money to get a sample of 20 large bags of popcorn, have them analyzed, and nd that they contain 1210 calories on average. To speak the language of statistical inference, we need a few de nitions: individuals or units or cases are the objects on which a measurement is taken.
