the number of observations in the entire population
the ith observation
add up Xi, where i is from 0 to N
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Subject 4. Measures of Center Tendency represent all the observations in the data set.
The population mean is the average for a finite population. It is unique; a given population has only one mean.
N = the number of observations in the entire population X i = the ith observation ΣX i = add up X i , where i is from 0 to N
The sample mean is the average for a sample. It is a statistic and is used to estimate the population mean.
last interval [days]
repetition number in this series
scheduled repetition interval
last repetition or drill
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