Biostatistics — Flashcards

Formula for Mean for grouped data, where the values are given in categories, where, \(Xg = mid-point \ of \ each \ group\) \(f = frequency \ of \ each \ group\) is, _____

observed Hb=18 g/dl mean Hb=14 g/dl standard deviation =2 g/dl z score=?

For small samples, to calculate significance of difference between means, t-test is applied →To compare unpaired data i.e independent observations done on individuals of two different or separate groups or samples drawn from two populations, _____ is used → t-value can be calculated by, \(t=\) _____, where s = _____

SE[standard error mean] formula(for quantitative data)

unknown confounder is treated with

c65872b736324b578b20a22eef5c027a-ao-6

formula for negative predictive value(PPV)

Some other measures of variability are: →Range = _____ →Coefficient of Range = _____ →Quartile Deviation = _____ →Coefficient of Quartile Deviation = _____ where, \(H\ =\ Highest\ Value\) \(L\ =\ Lowest\ Value\) \(Q_3 = 3(\frac {n+1}{4})^{th} observation\) \(Q_1 = (\frac {n+1}{4})^{th} observation\)

geometric mean is calculated in cases of _____

Coeffecient of variation, is given by _____