Answer:
C.I =  0.7608   ≤ p ≤   0.8392
Step-by-step explanation:
Given that:
Let consider a  random sample n = 400 candidates where  320 residents indicated that they voted for Obama
probability 
= 0.8
Level of significance ∝ = 100 -95% 
= 5% 
= 0.05
The objective is to  develop a 95% confidence interval estimate for the proportion of all Boston residents who voted for Obama.
The confidence internal can be computed as:

where;
 =
 =  = 1.960
 = 1.960
SO;






= 0.8 - 0.0392     OR   0.8 + 0.0392  
= 0.7608    OR    0.8392
Thus; C.I =  0.7608   ≤ p ≤   0.8392
 
 
        
             
        
        
        
Answer:
They are 14.2 feet high each
Step-by-step explanation:
1136/80=14.2
 
        
                    
             
        
        
        
He paid ...
-- The cost of the lunches      (100%  =  1.00 of it)     
-- 15% of the cost as a tip    (15%  =  0.15 of it)
-- 12% of the cost as sales tax  (12%  =  0.12 of it)
Total that he paid = (1.00 + 0.15 + 0.12)  =  1.27 of $248.40
                                                           =      $315.47   .
Trevor is one generous guy ! 
        
             
        
        
        
Answer:
yes
Step-by-step explanation: