Figuring percentages is determining how many of something is per 100. For example, 50 percent is the same as 50 per 100. More »

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To find the percentage, divide the part by the whole and multiply the result by 100. A percentage represents a portion of a whole. The portion over the whole is a fraction that can then be converted into a percentage. More »

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Bell curve percentages are various values that are used in the plotting of a density curve to represent a normal distribution in a histogram. The percentages obeyed by all bell curves are 68, 95 and 99.7. The curves are ... More »

Chi-square is a statistical test that detects whether an observed set of sample results are obtained by mere chance, or whether something other than chance is causing the data to vary. If the observed results sufficientl... More »

Probability, or the mathematical chance that something might happen, is used in numerous day-to-day applications, including in weather forecasts. For example, a weather forecast that predicts a 75 percent chance of snow ... More »

A statistic describes a sample, while a parameter describes an entire population. A sample is a smaller subset that is representative of a larger population. More »

In a grouped frequency distribution, data is sorted and separated into groups called classes, whereas in an ungrouped frequency distribution, a listing is made by pairing up each data value with the number of times that ... More »