A Manufacturer Claims That at Least 40% of Its Customers

Essay

A manufacturer claims that at least 40% of its customers use coupons. A study of 25 customers is undertaken to test that claim. The results of the study follow: $$\begin{array} { l l l l l } y e s & \text { no } & \text { no } & \text { yes } & y \text { es } \\\text { no } & \text { yes } & \text { no } & \text { no } & \text { yes } \\\text { no } & \text { no } & \text { no } & \text { no } & \text { yes } \\\text { no } & \text { no } & \text { no } & \text { no } & \text { yes } \\\text { no } & \text { no } & \text { yes } & \text { no } & \text { yes }\end{array}$$ At a .05 level of significance, use Excel to test the manufacturer's claim.