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assignment help 9853

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MIntroStat9 7.E.523.XP

Do various occupational groups differ in their diets? A British study of this question compared 90 drivers and 63 conductors of London double-decker buses. The conductors’ jobs require more physical activity. The article reporting the study gives the data as “Mean daily consumption ± (se).” Some of the study results appear below.

DriversConductorsTotal calories2824 ± 152842 ± 21Alcohol (grams)0.28 ± 0.120.35 ± 0.11

(b) Is there significant evidence at the 5% level that conductors consume more calories per day than do drivers? Use the conservative two-sample t method to find the t-statistic, and the degrees of freedom. (Round your answer for t to three decimal places.)t =df =Conclusion

Reject H0.

Do not reject H0.

(c) How significant is the observed difference in mean alcohol consumption? Use the conservative two-sample t method to obtain the t-statistic. (Round your answer to three decimal places.)

t =  Conclusion

Reject H0.

Do not reject H0.

(d) Give a 95% confidence interval for the mean daily alcohol consumption of London double-decker bus conductors. (Round your answers to three decimal places.)

(  ,  )

(e) Give a 99% confidence interval for the difference in mean daily alcohol consumption for drivers and conductors. (conductors minus drivers. Round your answers to three decimal places.)

(  ,  )

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