![]() ![]() sqrt =0.605 The 90% confidence interval is shown below.sqrt =0.495 Finally find the upper bound, rounding to three decimal places.First find the lower bound, rounding to three decimal places. Find the critical value that corresponds with a 90% confidence interval. Although technology or a table of critical values could be used to find the critical value, for the purposes of this exercise, use the table of critical values. Because a 90% confidence interval is requested, α=0.1. ![]() p = x / n p=121/220 p=0.55 Use the point estimate, p, to confirm the confidence interval can be found. Start by finding the point estimate, p, for the population proportion. 100% confidence interval for p is given by p±zα/2.
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