Parameters are descriptive measures of an entire population. However, their values are usually unknown because it is infeasible to measure...

Parameters are descriptive measures of an entire population. However, their values are usually unknown because it is infeasible to measure an entire population. Because of this, you can take a random sample from the population to obtain parameter estimates. One goal of statistical analyses is to obtain estimates of the population parameters along with the amount of error associated with these estimates. These estimates are also known as sample statistics. A fitted distribution line is a curve based on the parameter estimates instead of on the true parameter values.