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What is the difference between the sample mean and the population mean known as?
Sampling bias.
How do you calculate the mean percentage score?
The term "mean" is another way of saying "average." In order to calculate a mean percentage score, you must add together all the percentages, and divide the total by the amount of percentage scores being used.
Why the standard deviation of set of data will always be greater than zero?
The standard deviation is always be equal or higher than zero. If my set of data is limited to whole numbers, all of which are equal, the standard deviation is 0. In all other situations, we first calculate the difference of each number from the average and then calculate the square of the difference. While the difference can be a negative, the square of the difference can not be. The square of the standard deviation has to be positive, since it is the sum of all positive numbers. If we calculate s2 = 4, then s can be -2 or +2. By convention, we take the positive root.
As the sample size increase the difference between the sample mean and the population mean approaches what?
Zero
What is difference between mean and medium?
a mean is the average the medium is the number in the midle of the ordered numbers
