Given a mean of 2.1 and a standard deviation of 0.7,a 90% confidence interval will be 2.1 ± 0.7.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values, indicating how much individual data points deviate from the mean.

Confidence Interval

A collection of values from sample statistics, which is anticipated to capture the value of an obscure population parameter.

Population Mean

The average of all the values in a population, providing a summary measure of the population's central tendency.