Stats exam 2

Standard deviation

describes how far, on average, each observation is from the typical value. A larger standard deviation means that observations are more distant from the typical value, and therefore, more dispersed.

no negatives

How to find Sample Variance?

standard deviation squared (s²)

How to know if a statistic is resistant?

If it is NOT heavily affected by extreme values (outliers)

Z score

represents the number of standard deviations an observation is from the mean

how to find Z score

value-mean/SD

IQR

interquartile range

IQR= Q3 - Q1

range of the middle 50% of the data

Classical probability

used when each outcome in a sample space is equally likely

Empirical Probability

based on observations obtained from probability experiments

Subjective probability of an outcome

probability obtained on the basis of personal judgment

P(F|E)

probability of event F given event E

Mode

Occurs the most

Range

Largest value - smallest value