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.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Read MoreA picture is worth a thousand words
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
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