Figure 1. Percentage of 3- to 4-year-olds and 5-year-olds enrolled in school: October 2010 through October 2021
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A confidence interval is a range of values that describes the uncertainty surrounding an estimate. Throughout the Condition of Education, confidence intervals are calculated as the estimate +/- the margin of error, based on a 95 percent level of confidence. This means that there is 95 percent certainty that the range includes the true or actual value of the statistic.
Confidence Interval
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Users can select years at irregularĀ intervals. However, as a result, the distance between the data points will not be proportional to the number of years between them.
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NOTE: To estimate the margin of error, the standard error is scaled based on the desired level of confidence in the estimate. Throughout the Condition of Education, margins of error are produced based on a 95 percent level of confidence. Margin of error is calculated as 1.96*standard error. Data exclude children living in institutions (e.g., prisons or nursing facilities).

SOURCE: U.S. Department of Commerce, Census Bureau, Current Population Survey (CPS), October, 2010 through 2021. See Digest of Education Statistics 2022, table 202.20.