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The parts of a traditional piano have changed very little for___41___(hundred) of years.The keys a...

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πA,B(R)πD,E(S)  πA,B(R)-πC,D,E(S)  π3(R)∪π1(S)  π2(R)∩π1(S)  
Dim pi As Integer  Dim pi(7) As Integer  Dim pi As Single  Dim pi As Long  
H0:P1=P2=P3=P4=P5  H0:P1=P2=P3=P4>P5  H0:π1=π2=π3=π4=π5  H0:π1≠π2≠π3≠π4≠π5  H0:π1=π2≠π3=π4=π5  
P1、P2、P3全不相等  π1、π2、π3全相等  π1、π2、π3全不相等  π1、π2、π3不全相等  P1、P2、P3全相等  
σA<2(πA,B(R))=πA,B(σA<2(R))   πA,C(σA<2(R))=σA<2(πA,C(R))   πB,C(σA<2(R))=σA<2(πB,C(R))   πA(πA,B(R))=πA(R)  
Ho:P1=P2=P3=P4=P5  Ho:P1=P2=P3=P4>P5  Ho:π1=π2=π3=π4=π5  Ho:π1≠π2≠π3≠π4≠π5  Ho:π1=π2≠π3=π4=π5  
H0:p1=p2=p3=p4=p5  H0:p1=p2=p3=p4>p5  H0:π1=π2=π3=π4=π5  H0:π1≠π2≠π3≠π4≠π5  H0:π1=π2≠π3=π4=π5  
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P1、P2、P3全不相等  π1、π2、π3全相等  π1、π2、π3全不相等  π1、π2、π3不全相等  P1、P2、P3全相等  
Dim pi As Integer  Dim pi(7)As Integer  Dim pi As single  Dim pi As Long  
H0:p1=p2=p3=p4=p5  H0:p1=p2=p3=p4>p5  H0:π1=π2≠π3=π4=π5  H0:π1≠π2≠π3≠π4≠π5  H0:π1=π2=π3=π4=π5  
πA,B(R)πD,E(S)  πA,B(R)-πC,D,E(S)  π3(R)∪π1(S)  π2(R)∩π1(S)  
that    which    when    where  
Dim pi As Integer  Dim pi As Single  Dim pi As Boolean  Dim pi As Long  
Dim pi As Integer Dim pi(7)As Integer Dim pi As Single Dim pi As Long  

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