SOLUTION:
At 80% confidence level the z is ,
= 1 - 80% = 1 - 0.80 = 0.20
/ 2 = 0.20 / 2 = 0.1
Z/2 = Z0.1 = 1.282 ( Using z table )
At 82% confidence level the z is ,
= 1 - 82% = 1 - 0.82 = 0.18
/ 2 = 0.18 / 2 = 0.09
Z/2 = Z0.09 = 1.341 ( Using z table )
At 92% confidence level the z is ,
= 1 - 92% = 1 - 0.92 = 0.08
/ 2 = 0.08 / 2 = 0.04
Z/2 = Z0.04 = 1.751 ( Using z table )
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