00:01
So your question is, in descriptive statistics, what are the meaning of these words? and the mean is where we take the sum of all the data and divide by the total number, the number of data elements.
00:17
And it's an average.
00:19
And likewise, a mode is also an average, but it's the most frequently occurring value in your data.
00:32
Set.
00:34
And so, but these are both averages, as is a medium.
00:38
They're all measures of the center of the data.
00:41
You didn't ask about that one.
00:43
And then you asked about what a variance is.
00:47
And a variance is basically the mean of the squared deviations from the mean.
01:05
And so if i want to just give a quick example, if i have numbers 1, 2, 3, and 4, if i find their mean as a statistic, meaning that this is just a sample of data, i add up the four numbers, and i have 7, 8, 9, 10, and there are four numbers, so my mean is 2 .5.
01:26
I have no mode because i don't have a number that is more frequently occurring than any of the others.
01:33
And then if i want to calculate the variance, remember that s squared is a symbol for variance if it's a sample.
01:40
I'm going to assume that you're working with samples.
01:43
And so i take each number minus the mean and i square it.
01:49
And then i take the next number to minus 2 .5 and i square it.
01:54
And the next number, 3 minus 2 .5 and square it...