library

A tutorial on computing the interval estimate of population mean at given confidence level. The variance of the population is assumed to be unknown.

A tutorial on computing the interval estimate of population mean at given confidence level. The variance of the population is assumed to be known.

A tutorial on computing the point estimate of population mean from a simple random sample.

A tutorial on computing numerical measures of qualitative data in a data sample.

A tutorial on computing the bar graph of qualitative data in statistics.

A tutorial on computing the relative frequency distribution of qualitative data in statistics.

A tutorial on computing the frequency distribution of qualitative data in statistics.

A data sample is called qualitative, also known as categorical, if its values belong to a collection of known defined non-overlapping classes. Common examples include student letter grade (A, B, C, D or F), commercial bond rating (AAA, AAB, ...) and consumer clothing shoe sizes (1, 2, 3, ...).