Study about confidence interval, how to write confidence interval, use confidence interval formula, and practice confidence interval examples to estimate mean.

Learn how to find the critical z-value for a given confidence level, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge.

A confidence interval with p % confidence level means that p % of confidence intervals computed at this level contain the actual value of the parameter.

Learn about confidence interval and sample size. Study the sample size definition, and work through examples of the confidence level and sample size formula.

Confidence Intervals and Proportions Understanding confidence intervals and proportions can be useful in everyday life. For example, let's say that one day you might want to run your own business.

The confidence interval is a statistic that is used to estimate population parameters, such as the population mean and population proportion.

Learn how to construct a confidence interval for a population mean, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

Learn how to calculate an appropriate confidence interval for the slope of a regression, and see examples that walk through sample problems step-by-step for you to improve your statistics ...

Learn how to construct a confidence interval with a small sample size, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge.

What is a t-interval and the Margin of Error? t-interval: A range of values that is likely to include a population mean with a certain degree of confidence. Often called a point-estimate.