math help
posted by Tommy8 .
Consider the following. (Give your answers correct to two decimal places.)
(a) Determine the value of the confidence coefficient z(á/2) for 1  á = 0.87.
(b) Determine the value of the confidence coefficient z(á/2) for 1  á = 0.91.
can someone just work one of these and I will do the other by looking at example
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