x1 09 Experimental Design

9

Statistics

• Any value that is calculated from a set of observations is a statistic. A statistic conveys information about the observed values without giving all the observations.

• Prevalence and Incidence (introduced in lecture 8) are statistics of a disease in a population.

• Mean and median are statistics that measure ‘central tendency’ -where middle is.

Speaker Notes:

9

What statistic measures dispersion?