Sec. 12.1 - Sampling, Frequency Distributions, and Graphs
Population: The set containing all the people or objects whose
properties are to be described by the data collector.
Sample: The subset of the
Sec. 12.2 - Measures of Central Tendancy
Mean:(AKA average) = sum of the data items divided by the
number of items
Median = the middle number (if there is an odd number of
items), or the average of th
Sec. 12.3 - Measures of Dispersion
Range = Largest value minus smallest value = max - min
Standard Deviation :
n = number of data values
Find the range and the standard deviation.
1.)
Sec. 12.4 - The Normal Distribution
The 68-95-99.7 Rule: If the data are normally distributed,
then 68% of the data lie within 1 standard deviation of the
mean, 95% of the data lie within 2 standard d