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# Comparisons Between Confidence Interval Estimates

The overall miles per gallon (MPG) of 2009 Sedans priced under \$20,000.
27 31 30 28 27 24 29 32 32 27 26 26 25 26 25 24

(a) Construct a 95% confidence interval estimate for the population mean MPG of 2009 Sedans (4 cylinder) priced under \$20,000, assuming normal distribution.
(b) Interpret the interval constructed in (a).
(c) Compare the results in (a) to those in following problem:
Construct a 95% confidence interval estimate for the population mean MPG of 2009 SUVs priced under \$30,000, assuming normal distribution
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#### Solution Preview

Problem: The attached file (Sedans) contains the overall miles per gallon (MPG) of 2009 priced under \$20,000.
27 31 30 28 27 24 29 32 32 27 26 26 25 26 25 24
(a) Construct a 95% confidence interval estimate for the population mean MPG of 2009 sedans (4 cylinder) priced under \$20,000, assuming normal distribution.
(b) Interpret the interval constructed ...

#### Solution Summary

The comparisons between confidence interval estimates are determined.

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