Slovin's formula is written as n = N/(1+Ne^2). In the formula, n = the number of samples needed, N = total population and e = error tolerance.
Slovin's formula is used in statistical analysis as a tool to determine the sample size of a population that must be taken for a specific study. This formula is only used when the sample size is unknown; for example, since things like IQ scores tend to follow a predictable distribution pattern, it is easy to find an appropriate sample size for studying this topic. Using the formula, statisticians can come up with a reliable sample size to study a given population without having to study the entire population individually.
Learn MoreThe formula for percentile is to take the number of scores below a designated number and then divide that figure by the total number of scores. A decimal results, but once it is multiplied by 100, it gives a whole number that represents the percentile rank of a score.
Full Answer >The Interquartile Range Formula appears as "Q3 - Q1," where Q3 is the upper quartile and Q1 is the lower quartile of a data set. The interquartile range is also commonly referred to as the middle fifty or midspread.
Full Answer >In medicine, odds ratio formula is the measure of odds of association between exposures divided by the odds of the outcomes (odds ratio = (ad/bc)). The formula is used to measure the strength of absence or presence of a property in a given population.
Full Answer >The Chi square statistic is the sum of the squared differences between the observed and expected frequencies divided by the expected frequencies. Chi square = Sum [(observed frequency - expected frequency)^2/expected frequency)]
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