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Sin categoría / Statistics

A picture is worth a thousand words

There are three possible strategies o verify that a variable follows a normal distribution: methods based on hypothesis testing, those based on graphical representations and the so-called analytical methods.

02/22/2022

Sin categoría / Statistics

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.

01/25/2022
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Sin categoría / Statistics

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.

01/11/2022

Sin categoría

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

12/07/2021

Step by step

Chi-square test for independence

The chi-square test for independence allows us to compare the proportions of two qualitative variables to see if they are related

11/02/2021