As the new manager of a small convenience store you want to

As the new manager of a small convenience store, you want to understand the shopping patterns of your customers. You randomly sample 20 purchases from yesterday\'s records. The amounts of those purchases (in dollars) are shown to the right.

Solution

b) a z score which is less than -1.96 and greater than 1.96 are considered exterme.

hence the maximum purchse is more extreme.