Question

various occupational groups differ in their diets? A British study of this question compared 90 drivers and 70 conductors of London double-decker buses. The condutors' jobs require more physical ivity. The article reporting the study gives the data as "Mean daily consumption ± (se)." Some of the study results appear below Drivers Conductors Total calories 2826 ± 15 2841 ± 18 Alcohol (grams) 0.24 t 0.08 0,38 0.14 (a) Give x and s for each of the four sets of measurements. (Give answers accurate to 3 decimal places.) Drivers Total Calories: x = 2826 s-142.302 Drivers Alcohol: x24 S759 conductors Total Calories: x = 2841 s= 150.599 Conductors Alcohol: x- .38 s= 1.171 (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.) t0.640 df= 69 Conclusion Reject Ho- O Do not reject Ho. (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.) XConclusion Reject Ho- Do not reject Ho (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.) x) (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.) Enter a number

Answer 1

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