# Category Sin categoría

## A tricky riddle

The harmonic mean is the reciprocal of the arithmetic mean. It is calculated as the total number of observations divided by the sum of the reciprocals. It is used in situations in which it is necessary to average paths of equal length with different times, as well as to average multiples or quotients.

## A measure with a pedegree

The sample size required to estimate a population mean depends on the desired level of confidence and precision, in addition on the variable’s variance in the population.

## If you doubt, better in the middle

The sample size required to estimate a population proportion depends on the desired level of confidence and precision, in addition on the value of the proportion in the population

## The brewer

Student’s t distribution. Student’s t probability distribution allows estimating the value of the population mean of a random variable that follows a normal distribution when the parameter is extracted from a small sample and the population variance is unknown.

## A story of tea and numbers

Fisher’s exact test. Fisher’s test is the exact method used when you want to study if there is an association between two qualitative variables, that is, if the proportions of one variable are different depending on the value of the…

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