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Question: n order to investigate the relationship between mean life time...

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n order to investigate the relationship between mean life time in years among people who do not smoke and those who smoke regularly. Two random samples of each type of person were taken, with the following results: 

 

n

s

Nonsmoker

180

72

7

Smoker

200

63

16


What are the assumptions to test the hypothesis concerning the difference between two population means for the given scenario?

 

a.
The samples are independent and n1 ≥ 30.
b.
The samples are independent and n≥ 30.
c.
The samples are dependent.
d.
The samples are dependent and both n1 ≥ 30 and n≥ 30.
e.
The samples are independent and both n1 ≥ 30 and n≥ 30.
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