Pr{z<=1.0805}~=0.86
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The Z-value for a one-sided 91% confidence interval is 1.34
1.96
1.15
The answer depends on whether the test is one-tailed or two-tailed.One-tailed: z = 1.28 Two-tailed: z = 1.64
The two tailed critical value is ±1.55