Author Archives: Tanner Paige Floisand

Confidence interval for a single proportion

A confidence interval gives an estimated range of values which is likely to include an unknown population parameter, the estimated range being calculated from a given set of sample data, as this site puts it. This site says statisticians use a confidence interval to describe the amount of uncertainty associated with a sample estimate of a population parameter.  They are used […]


IQR, or Interquartile Range, is a robust measure of scale calculated by taking the third and the first quartiles in a set of data and subtracting them and is used in descriptive statistics. To find either of these quartiles, you must first find the median of  a set of numbers. These two halves then have […]

Bar Graphs

A bar graph is a graph drawn using rectangular bars to show how large each value is. One could use a bar graph to show how something varies over time or to contrast items as described here. While a bar graph is visually easy to understand, the disadvantages, from this site, would be that graph […]