Question: n order to investigate the relationship between mean life time...
Question details
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:
What are the assumptions to test the hypothesis concerning the difference between two population means for the given scenario?

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 n_{1} ≥ 30.


b. 
The samples are independent and n_{2 }≥ 30.


c. 
The samples are dependent.


d. 
The samples are dependent and both n_{1} ≥ 30 and n_{2 }≥ 30.


e. 
The samples are independent and both n_{1} ≥ 30 and n_{2 }≥ 30.
