# Biostats Week 7 Flashcards

µ

Mu. Mean of a population or probability distribution

t

1) a particular probability distribution or 2) a value that obeys that distribution

z-score

s (standard deviation)

s

standard deviation

µ

mean

σ

Sigma. Standard deviation of a population.

m

Mean of a sample

s^2

Sample variance

n

Number of cases

Median

score that divides a distribution in half; the mathematical midpoint

Mode

The value that appears most often during the dataset

Bimodal distribution

a distribution containing two numeric values that appear with equal frequency

Variability

extent to which the scores are dispersed around the mean

Range

difference between the highest and lowest values in a distribution

Deviations from the mean

calculated by subtracting the mean from a given score; sum of the deviations will always equal zero

Mean deviation

Sum of mathematically absolute deviations from the mean of the distribution