Zero population means that there is no growth in the number of people or animals or plants in an area. The number of deaths equal the number of births.
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The population mean is the mean value of the entire population. Contrast this with sample mean, which is the mean value of a sample of the population.
z score is defined as z = (x-mean)/sd, where mean is the mean of the sample (or population) and sd is the standard deviation of the sample or the population. x is the raw score. z-score standardizes the data. The standardized data will have a zero mean and unit variance. It has numerous applications in statistics.
Zero.
No.