Image caption, To find the mean age, use a calculator to divide the total age of all the children (168) by how many children there are (15). 168 ÷ 15 = 11.2. The mean age is 11.2 years old.

While Excel is useful for many applications, it is an indispensable tool for those managing statistics. Two common terms used in statistics are Standard Deviation and ...

The size of the data set—the sample size—doesn't affect standard deviation, but the sample size is a key factor in calculating the SEM. A larger random sample will always provide a mean that ...