Data is neither sample nor population. Data are collected for attributes. These can be for a sample or a population.
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The sample must have a high probability of representing the population.
A sample consists of a small portion of data when a population is taken from a large amount.
Data gathered i n two different samples such as the sample data drawn from one population is completely unrelated to the section of sample data,
sample
Yes, it does. If the data are sample data, than the divisor is N. If the data are the entire population, than the divisor is N-1 is account for the loss of one degree of freedom in the calculation of both the mean and the standard deviation from the same data.