Critical Values: z0.05 = 1.645, z0.025 = 1.96, z0.01 = 2.325 When d.f.=35: t0.05 = 1.690, t0.025 = 2.030, t0.01 = 2.438 With a confidence level of 98% and a 3% margin of error, find the sample size needed to estimate the percentage of citizens who have used a credit monitoring service. Use the fact that previous results indicate that about 30% of adults have used a credit monitoring service.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.