Sample Size Calculation — Flashcards

Flashcard 1: Statistical power of a test is calculated as _____

Answer: 1-(Type II error)

Flashcard 2: In a moderately skewed distribution, Mean = _____ (expressed using Median and Mode)

Answer: (3 Median - Mode) / 2

Extra: Empirical relationship in a moderately skewed distribution: Mode = 3 Median - 2 Mean

Flashcard 3: In order to determine a confidence interval of a _____ at a given alpha value, the standard deviation, and sample size are also necessary

Answer: sample mean

Flashcard 4: _____ t-test is used to compare two groups of patients for a quantitative variable

Answer: Unpaired/student

Flashcard 5: The confidence interval is smaller with a _____ sample size.

Answer: larger (larger/smaller)

Flashcard 6: The _____ is a measure of variability, based on dividing a data set into quartiles

Answer: interquartile range (IQR)

Flashcard 7: Which indicator is most useful for evaluating the effectiveness of a health program?

Answer: Incidence

Extra: Incidence (the rate of new cases) is the most sensitive indicator for evaluating the effectiveness of health programs, particularly those aimed at prevention and control. \n\nNote: For evaluating the impact of a treatment program for chronic diseases, prevalence might be used, but incidence remains the gold standard for program effectiveness.

Flashcard 8: What type of distribution is this? _____

Answer: Normal

Flashcard 9: What type of distribution is this? _____

Answer: Negative/Left

Flashcard 10: What type of distribution is this? _____

Answer: Positive/Right