For a standard normal distribution, which of the following expressions must always be equal to 1 ?
Answer
A
cap p times open paren z is less than or equal to negative A close paren minus cap p times open paren negative A is less than or equal to z comma z is less than or equal to A close paren plus cap p times open paren z is greater than or equal to A close paren
B
cap p times open paren z is less than or equal to negative A close paren minus cap p times open paren negative A is less than or equal to z comma z is less than or equal to A close paren minus cap p times open paren z is greater than or equal to A close paren
C
cap p times open paren z is less than or equal to negative A close paren plus cap p times open paren negative A is less than or equal to z comma z is less than or equal to A close paren plus cap p times open paren z is greater than or equal to A close paren
D
cap p times open paren z is less than or equal to negative A close paren plus cap p times open paren negative A is less than or equal to z comma z is less than or equal to A close paren minus cap p times open paren z is greater than or equal to A close paren