Explain the statement below: "The medical community is generally well informed about the use of proper...

Explain the statement below:

"The medical community is generally well informed about the use of proper statistical techniques used to analyze differences between means".

Expert Solution

This test (as described below) assumes: (a) A normal (gaussian) distribution for the populations of the random errors, (b) there is no significant difference between the standard deviations of both population samples.

The two means and the corresponding standard deviations are calculated by using the following equations (n_A and n_B are the number of measurements in data set A and data set B, respectively):

Then, the pooled estimate of standard deviation s_ABis calculated:

Finally, the statistic t_exp(experimental t value) is calculated:

t_expvalue is compared with the critical (theoretical) t_th value corresponding to the given degree of freedom N (in the present case N = n_A + n_B - 2) and the confidence level chosen. Tables of critical t values can be found in any book of statistical analysis, as well as in many quantitative analysis textbooks. If t_exp>t_ththen H₀ is rejected else H₀ is retained.

orchestra answered 2 years ago

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