a. Of the quantities p Subscript 1 , p Subscript 2 , x Subscript 1 , x Subscript 2 , ModifyingAbove p with caret Subscript 1 , ModifyingAbove p with caret Subscript 2 , and ModifyingAbove p with caret Subscript p , which represent parameters and which represent statistics?
b. Of the quantities p Subscript 1 , p Subscript 2 , x Subscript 1 , x Subscript 2 , ModifyingAbove p with caret Subscript 1 , ModifyingAbove p with caret Subscript 2 , and ModifyingAbove p with caret Subscript p , which are fixed numbers and which are variables?