Stats Solutions

(See) Refer to problem #8. Construct the 90%, 95%, and 99% confidence intervals for μ _1-μ _2 where μ _1 represents the population mean shelf-life

Question: Refer to problem #8. Construct the 90%, 95%, and 99% confidence intervals for \[{{\mu }_{1}}-{{\mu }_{2}}\] where \[{{\mu }_{1}}\] represents the population mean shelf-life in days for Brand S bread and \[{{\mu }_{2}}\] presents the population mean shelf-life in days for Brand H bread. Use the formula on page 440. Write a few sentences comparing your confidence interval results with the hypothesis test results in #8.

Brand S Brand H
\[\overline{{{x}_{1}}}=4.1\] days \[\overline{{{x}_{2}}}=5.2\] days
\[{{\sigma }_{1}}=1.2\] days \[{{\sigma }_{2}}=1.4\] days
\[{{n}_{1}}=35\] \[{{n}_{2}}=35\]
population mean \[{{\mu }_{1}}\] population mean \[{{\mu }_{2}}\]

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