Biology quiz #1 STATS

mean

average of a set of data

median

middle number of a set of data

mode

number that occurs most in a set of data

qualitative

data that can be observed using senses; categorical

independent

variable that is changed by the experimenter

dependent

what is measured

constants

all the factors that remain the same throughout an experiment

positive control

not exposed to experimental treatment or independent variable; is exposed to treatment known to produce the expected effect

negative control

group not exposed to any treatment or one that is known to have no effect

bias

for or against something based on your interests

std dev

measures how spread out the data is from the mean

standard error

used to determine the precision of and confidence in the mean value; difference between sample mean and population mean