Consider the following. (Give your answers correct to four decimal places.)

(a) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.65.
Incorrect: Your answer is incorrect. .

(b) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.93.
Incorrect: Your answer is incorrect. .

(c) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 2.17.


(d) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 2.41.