Question

Do various occupational groups differ in their diets? A British study of this question compared 87 drivers and 53 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.

	Drivers	Conductors
Total calories	2818 ± 43	2850 ± 46
Alcohol (grams)	0.21 ± 0.1	0.45 ± 0.06

(a) Is there significant evidence at the 5% level that conductors consume more calories per day than do drivers? Use the pooled two-sample t test to obtain the P-value. (Give answers to 3 decimal places.)

t=

df=

P-value=

Answer 1

a)

from above

t=-4.159 (try 4.159 if this comes wrong and revet)

df=138

p value =0.000