Biostatistics — Flashcards

Flashcard 21: cut off for z score is _____

Answer: 2 SD(standard deviate)

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Flashcard 22: Sample size for quantitative data when SD of population is known and allowable error L is given: _____

Answer: \(n = \frac{4SD^2}{L^2}\)

Extra: The formula for sample size for estimating a population mean with a 95% confidence level (where Z ≈ 1.96 ≈ 2) is n = (Z² * σ²) / L². Substituting Z=2 gives n = 4σ²/L².

Flashcard 23: 3675d56a2e7b4499a8f95928687a3c92-ao-1

Answer: sensitivity,specificity,PPV,NPV relations-MCQ AIIMS 18

Extra: ? P for P goes down 

Flashcard 24: Standard Error (SE) is the _____.

Answer: standard deviation of the sampling distribution of the mean

Extra: Standard Error (SE) = SD / √n Standard Error represents the standard deviation of the sampling distribution of the mean. It indicates how much the sample mean is expected to vary from the true population mean.

Flashcard 25: standard deviation =3 mean =18 coefficient of variation=_____%

Answer: 16.67

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Flashcard 26: global annual growth rate is _____%

Answer: 1.07

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Flashcard 27: 5ce54378cee641398d486f0bc8c03a91-ao-2

Answer: false negative error rate

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Flashcard 28: Mean for Ungrouped series, when x = observations given n = total number of observations given _____

Answer: \(\bar{x} = \frac{\sum x}{n}\)

Flashcard 29: mid year population is calculated on _____

Answer: 1st july

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Flashcard 30: yield of a test corresponds to _____

Answer: PPV

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