"Stackable" coupons O allow you to add a discount onto another discount
O cause you to choose which discount to use
O can only be used with certain items
O are very few

Allow you to add a discount to another discount.

Step-by-step explanation:

A. 2.65

Step-by-step explanation:

Let mu1 be the mean number of cars that one employee is involved in Detroit plant per day

And mu2 be the mean number of cars that one employee is involved in Mexico City plant per day

Null and alternative hypotheses are:

This is one tailed t test and one tailed test statistic is given as 2.650.