17.Cedex wants to compare the performance of two manufacturing methods Method 1, in which products are grouped into families, and Method 2, in which production equipment is grouped into families. The number of units produced using either manufacturing method follows a normal distribution. normal distribution. The number of units manufactured using either manufacturing method was observed for 120 randomly selected days. number of units manufactured using method 1 and for 150 days the number of units manufactured using of units manufactured using method 2. Let Xi1: the number of units manufactured on day i using method 1, and Xi2: the number of units manufactured on day i using method 2. The means and variances obtained for each method are presented below.