Biostatistics — Flashcards

_____ is the most robust measure of central tendancy

For applying Z-test, \(Z = \) _____ Now to test significance, _____ or, \(Z=\) _____, where s = _____ If _____ at given level of significance, then the observed difference is said to be statistically _____ (_____ is rejected in favor of _____)

standard error mean is calculated for _____ data

Formula for Mean for grouped data using the assumed mean method, where, → \(Xg = Mid-point \ of \ each \ groups \ is \ taken \) and, any convenient group may be taken as working mean (\(w\)) → \(f = frequency \ of \ each \ group\) → Working units are denoted as, _____ where, \(i = Group \ interval\) → Then, Grouped weight is derived by \(f \times X \) Now, Mean in Working units is, _____ Real Mean is given by, _____

variance=

major determinant of age dependancy ratio is _____

false negative error rate is related to _____ error

1st census was conducted in _____

For small samples, to calculate significance of difference between means, t-test is applied → To compare the mean of a single group of observations with a specified value, _____ is done → \(t = \) _____ → Obtained value is compared to t-value given for given degree of freedom (_____) and significance level (corresponding p-value) from table → If t-value obtained > given t-value, then the difference is said to be statistically _____

formula for FPER(False positive error rate)