In most practical applications,the population standard deviation will not be known but it is estimated from the ________.

A) population
B) sample
C) test statistic
D) t-distribution

Population Standard Deviation

A measure of the spread of all values in a population, indicating how much the values differ from the mean of the population.

Sample

A subset of a population used for statistical analysis, selected for the purpose of making generalizations about the total population.

Estimated

An approximation or educated guess based on available data, rather than an exact measurement.