I only need help on the confidence interval questions at the end. I don't know how to the formula with standard error instead of standard deviation. Please show steps so I can finish the whole assignment.

Do varlous occu patlonal groups diiier In their diets? A British smdy oi this question compared 35 drivers and 65 conductors or London dou bledecxer buses. The conductors' jobs require more physical actMty. The article reporting the study gives the data as "Mean daily consumption :i: (sew Some of the study results appear below. Drivers Conductors 1hta| calories 2825 :I: 14 2345 t 22 Alcohol (grams) I125 1 13.1 0.39- : 0.12 [a] Give J? and s for each of the four sets of measurements. [Give answers accurate to 3 decimal places.) Drivers Tomi Calories: E = .r s = m Drivers Alcohol: .1? = .f s = IE Conductors Total Calories: .17 = E .f s = IE Conductors Alcohol: i = .0 s = IE [b] Is there signicant evidence at the 5% level that conductors consume more calories per clay than do drivers? Use the conservative two-sample 1' mediod to find the tstatlstlc, and the degrees of freedom. (Round your answer for 1' to diree decimal places.) I= .r29 x or: his x Conclusion -' Reject HID . 0 Do not reject H0. II [c] How slg niflcant ls die observed difference In mean alcohol consumption? Use the conservadve two-sample I method to obtain the tsta'dsdc. {Round your answer to three decimal places.) 1' = |:| Conclusion -' REjECI Ha . .- Do not reject H0. [d] Give a 95% confidence Interval for die mean daily alcohol consumption of London double-decker bus conductors. [Round your answers to three decimal places.) [:r|:|1I [3) Give a 99% condence interval for the difference In mean daily alcohol consumption for drivers and conductors. (conductors mInus drivers. Round your answers to three decimal places.) r _