BackConfidence Intervals for Population Proportion - Excel definitions
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1/15BackSkip to main contentBackConfidence Interval
Range of values estimated to contain the true population proportion with a specified level of certainty. Population Proportion
Fraction of individuals in a population exhibiting a particular characteristic, estimated using sample data. Sample Proportion
Ratio of favorable outcomes to total sample size, calculated from collected data. Margin of Error
Amount added and subtracted from the sample proportion to create the confidence interval boundaries. Critical Value
Number from the standard normal distribution used to determine the margin of error for a given confidence level. Standard Normal Distribution
Probability distribution with mean zero and standard deviation one, used for z-value calculations. Alpha
Probability of error, found by subtracting the confidence level from one; used in critical value calculations. Confidence Level
Probability that the calculated interval contains the true population proportion, often expressed as a percentage. COUNTIF
Excel function that counts occurrences of a specified value within a selected range of cells. NORM.S.INV
Excel function returning the z-value for a given left-tail probability in the standard normal distribution. Lower Bound
Smallest value in the confidence interval, calculated by subtracting the margin of error from the sample proportion. Upper Bound
Largest value in the confidence interval, calculated by adding the margin of error to the sample proportion. Sample Size
Total number of individuals surveyed or observed in the sample, used in proportion calculations. Square Root
Mathematical operation used in the margin of error formula to account for variability in sample proportions. Random Selection
Method of choosing individuals for a sample to ensure unbiased representation of the population.
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