Suppose that among the population of smartphone owners with
16
GB
16GB16, start text, G, B, end text of storage, the mean amount of storage used is
13
GB
13GB13, start text, G, B, end text and the standard deviation is
3
GB
3GB3, start text, G, B, end text. A consumer research group regularly takes random samples of
50
5050 of these customers and calculates the mean amount of storage
x
ˉ
x
ˉ
x, with, \bar, on top used in each sample.