The parameter being assessed is the average cost per square foot in the pacific region (represented by u). The hypothesis will be based on the salesman's claim that the mean cost per square foot in the pacific region is less than $280, which means the null hypothesis (h0) is u=$280. The alternate hypothesis (h1) will be u<$280. This implies I will be utilizing the left-tailed test since the objective is to determine whether the salesman claim that the average cost per square foot is lower than $280