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Unformatted text preview: mean gas mileage of 26 mpg. ( = 1.5) A consumer group suspects that it is less. A sample of 33 cars had an average of 25.2 mpg. Statistical Reasoning: Assume that the true mean is 26 mpg. Is it just by chance that the sample average is less, or does this indicate that the true mean is less? 4 If the true mean is 26 mpg, how likely is it that 33 cars would have an average of 25.2 mpg or less? 5 Example 2. A company produces a 454 g bag of pretzels. ( = 3.9) To check the filling process, 50 bags are selected and weighed. The average weight was 455 g. Is there evidence to indicate that the bags are not filling properly? 6 7 8 9 10 11 12 13 14...
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This note was uploaded on 02/15/2009 for the course STAT 2004 taught by Professor Melutz during the Fall '07 term at Virginia Tech.
 Fall '07
 MELutz
 Statistics

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