# Question

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 = 0.80

b. 1 - a = 0.98

c. 1 - a = 0.75

a. 1 - a = 0.80

b. 1 - a = 0.98

c. 1 - a = 0.75

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