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The proportion of the first 36 customers who wait for more than 15 minutes at a Certain Restaurant between 5 p.m. and 9 p.m. is recorded for 90 independent replications of a simulation model with identical initial conditions. The recorded proportions have a sample mean of 0.28. Construct a 95% confidence interval for this proportion. z0.1 = 1.28, Z0.05 = 1.64, z0.025 = 1.96.
Half-width of the interval:
Central value:
Lower bound:
Upper bound: