# Question: Find a the area of one tail and the confidence

Find a, the area of one tail, and the confidence coefficients of z that are used with each of the following levels of confidence.

a. 1 - a = 0.90

b. 1 - a = 0.95

c. 1 - a = 0.99

a. 1 - a = 0.90

b. 1 - a = 0.95

c. 1 - a = 0.99

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