Biostatistics — Flashcards

Flashcard 121: formula for false negative error rate(FNER)

Answer: Fn/Fn+Tp

Extra: 

Flashcard 122: For small samples, to calculate significance of difference between means, t-test is applied, → To compare paired data i.e. independent observations from one sample only, _____ is used t-value is given by, \(t=\) _____

Answer: paired t-test

Extra:  y

Flashcard 123: Annual growth rate (natural growth rate) of India is _____% (SRS 2020)

Answer: 1.35

Extra: As per Sample Registration System (SRS) 2020 data, the Natural Growth Rate of India is 13.5 per 1000 (1.35%). As per Census 2011, the Annual Growth Rate was 1.64%.

Flashcard 124: First synchronous census in India was conducted in _____

Answer: 1881

Extra: The first census in India was conducted in 1872 (non-synchronous). Since 1881, synchronous censuses have been conducted every 10 years.

Flashcard 125: false negative error rate is related to _____ error

Answer: type 2

Extra: 

Flashcard 126: Variance =

Answer: (SD)²

Flashcard 127: 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, _____

Answer: \(X = \frac {Xg - w}{i}\)

Extra: y

Flashcard 128: Major determinant of age dependency ratio is _____

Answer: young dependency ratio

Flashcard 129: diagnostic capacity of a test is given by _____

Answer: positive predictive value

Extra: The positive predictive value (PPV) indicates the probability that a person with a positive test result actually has the disease. It is influenced by the prevalence of the disease in the population.

Flashcard 130: Standard Normal Deviate or Variate (Z):\n_____

Answer: Z = (Observation - Mean) / SD

Extra: The Z-score (Standard Normal Deviate) indicates how many standard deviations an observation is from the mean in a normal distribution.