Do various occupational groups differ in their diets? A Britishstudy of this question compared 85 drivers and 65 conductors ofLondon double-decker buses. The conductors' jobs require morephysical activity. The article reporting the study gives the dataas "Mean daily consumption ± (se)." Some of the study resultsappear below. Drivers Conductors Total calories 2820 ± 42 2840 ± 48Alcohol (grams) 0.23 ± 0.09 0.44 ± 0.05 What justifies the use ofthe pooled two-sample t test? The similarity of the sample standarddeviations suggests that the population standard deviations arelikely to be similar. The similarity of the sample means suggeststhat the population standard deviations are likely to be different.The similarity of the sample means suggests that the populationstandard deviations are likely to be similar. The similarity of thesample standard deviations suggests that the population standarddeviations are likely to be different. Is there significantevidence at the 5% level that conductors consume more calories perday than do drivers? Use the pooled two-sample t test to obtain theP-value. (Give answers to 3 decimal places.) t = df = P-value =
