Biostatistics — Flashcards

Flashcard 21: cut off for z score is _____

Answer: 2 SD(standard deviate)

Extra: 

Flashcard 22: formula for specificity

Answer: True Negatives / (True Negatives + False Positives) (d / (b + d) in a 2x2 table)

Extra: Specificity is the true negative rate, representing the proportion of people without the disease who test negative.

Flashcard 23: IDD(iodine def. disorder) survey is done using _____ sampling method

Answer: cluster

Extra: 

Flashcard 24: _____ is a joined column graph used for representing quantitative data.

Answer: Histogram

Flashcard 25: 5ce54378cee641398d486f0bc8c03a91-ao-2

Answer: false negative error rate

Extra: 

Flashcard 26: _____ is a measure of internal consistency of a questionnaire

Answer: Cronbach's alpha

Extra: Cronbach's alpha is a measure of internal consistency (reliability) for scales and questionnaires. It ranges from 0 to 1, with values > 0.7 generally considered acceptable.

Flashcard 27: standard deviation =3 mean =18 coefficient of variation=_____%

Answer: 16.67

Extra: 

Flashcard 28: global annual growth rate is _____%

Answer: 1.07

Extra: 

Flashcard 29: Sample size calculation for qualitative data, when proportions are given \(p = positive \ character\ in \ \%\) \(q= negative\ character\ in\ \% (100-p) \) \(L = allowable \ error, \ usually \ 10 \% \ or \ 20\% \ of \ p\) is given by _____

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

Flashcard 30: Mean for Ungrouped series, when x = observations given n = total number of observations given _____

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