7 terms

Statistics

how many data points do we need to develop an accurate representation of the overall data

Standard Deviation

a measurement of how data spreads around the mean

Standard deviation represents how much of the data within +/- 1 standard deviation of the mean?

68%

Standard deviation represents how much of the data within +/- 2 standard deviation of the mean?

95%

Random Sample

each thing must have an equal chance of being selected

T-Test

has two sets of data; more degrees of freedom (which strengthens the argument); and sees if chance played a role in the data results

Error Bar

graphical representation of the variability of data; used to show the range or standard deviation on a graph