Answer:
He will be unable to tell whether a difference in exercise preference is related to a difference in age or to a difference in weight
Step-by-step explanation:
age could be a factor to exercise as well as weight so both affect the outcome so he has two samples 
 
        
             
        
        
        
Answer:
216π cubic centimeters
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: 
1 5/6
Step-by-step explanation:
6 1/3-4 1/2= 19/3-9/2= 38/6-27/6= 11/6= 1 5/6
Ans: She will need 1 5/6 more fabric.
 
        
             
        
        
        
Answer:
168
Step-by-step explanation: