Do various occupational groups differ in their diets? A British study of this question compared91drivers and66conductors 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 calories282211284720Alcohol (grams)0.240.110.380.14

(a) Givexandsfor each of the four sets of measurements. (Give answers accurate to 3 decimal places.)

Drivers Total Calories:x=______________

s=_______________

Drivers Alcohol:x=_____________

s=_____________

Conductors Total Calories:x=

s=

Conductors Alcohol:x=

s=

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

t=

df=

Conclusion

RejectH₀.

Do not rejectH₀.

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

t=____________Conclusion

RejectH₀.

Do not rejectH₀.

(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.)

(__________,________________)