Find a 90% confidence interval if 112 agree and 288 disagree in a random sample of 400 people.

Give 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.