Point estimate for the population proportion formula
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To calculate the confidence interval, you must find p′, q′, andEBP. p′ = 0.842 is the sample proportion; this is the point estimate of the population proportion. Since CL = 0.95, then α = 1 – CL = 1 – 0.95 = 0.05 (α) = 0.025. Use the TI-83, 83+, or 84+ calculator command invNorm(0.975,0,1) to find z 0.025.
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