Category Statistics

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.

Sample size for estimating a mean Sample size for estimating a mean

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.

Manuel Molina
01/11/2022

Statistics, Step by step

Probability calculations with a normal distribution

Step by Step. Probability calculations with a normal distribution. A series of examples of how to do probability calculations with a normal distribution are shown, as well as the advantages of standardizing the data.

Manuel Molina
08/31/2021

Sin categoría, Statistics

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. Something…

Manuel Molina
07/06/2021

Statistics

A strenuous effort, though unnecessary

Factors that condition the sample size. The need to perform a correct calculation of the sample size necessary for a study is reviewed, as well as the main factors that influence the sample required to demonstrate the effect considered relevant…

Manuel Molina
05/04/2021