The following gives information about the proportion of a sample that agree with a certain statement. Use StatKey or other technology to find a confidence interval at the given confidence level for the proportion of the population to agree, using percentiles from a bootstrap distribution. StatKey tip: Use "CI for Single Proportion" and then "Edit Data" to enter the sample information. Find a 99% confidence interval if, in a random sample of 1000 people, 382 agree, 578 disagree, and 40 can't decide. Click here to access StatKey.