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Unformatted text preview: a mean gas mileage of 26 mpg. (σ = 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? If the true mean is 26 mpg, how likely is it that 33 cars would have an average of 25.2 mpg or less? 3 4 Example 2. A company produces a 454 g bag of pretzels. (σ = 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? 5 6 7 8 9 10 11 12 13...
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 Fall '07
 MELutz
 Statistics, Null hypothesis, Statistical hypothesis testing, true mean, hypothesis testing procedure

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