Do various occupational groups differ in their diets? A British study of this question compared 86...

80.2K

Verified Solution

Question

Statistics

Do various occupational groups differ in their diets? A Britishstudy of this question compared 86 drivers and 52 conductors ofLondon double-decker buses. The conductors' jobs require morephysical activity. The article reporting the study gives the dataas \"Mean daily consumption Â± (se).\" Some of the studyresults appear below.
Drivers Conductors
Total calories Â Â 2820 Â± 45Â Â Â Â Â 2842 Â± 46Â Â Â
Alcohol (grams) 0.23 Â± 0.09 0.37 Â± 0.15
What justifies the use of the pooled two-sample ttest?
The similarity of the sample means suggests that the populationstandard deviations are likely to be similar.
The similarity of the sample standard deviations suggests thatthe population standard deviations are likely to bedifferent.Â Â Â Â Â
The similarity of the sample means suggests that the populationstandard deviations are likely to be different.The similarity ofthe sample standard deviations suggests that the populationstandard deviations are likely to be similar.

Is there significant evidence at the 5% level that conductorsconsume more calories per day than do drivers? Use the pooledtwo-sample t test to obtain the P-value. (Giveanswers to 3 decimal places.)
t =
df =
P-value =

	Drivers	Conductors
Total calories	Â Â 2820 Â± 45Â Â Â	Â Â 2842 Â± 46Â Â Â
Alcohol (grams)	0.23 Â± 0.09	0.37 Â± 0.15

Answer & Explanation Solved by verified expert

4.1 Ratings (716 Votes)

SolutionThe similarity of the sample standard deviationssuggests that the population standard deviations are likely to besimilarState the hypotheses The first step is tostate the null hypothesis and an alternative hypothesisNull hypothesis See Answer

Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:

Unlimited Question Access with detailed Answers
Zin AI - 3 Million Words
10 Dall-E 3 Images
20 Plot Generations
Conversation with Dialogue Memory
No Ads, Ever!
Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!

Become a Member