【简答题】Consider the seven pairs of measurements( x 1 , x 2 ) plotted in Figure 1.1: x 1 3 4 2 6 8 2 5 x 2 5 5.5 4 7 10 5 7.5 Calculate the sample means and , the sample variances and , and the sample covaria...
【单选题】In testing for differences between the means of two independent populations where the variances are unknown and different, we need to calculate the degrees of freedom. If the degrees of freedom is no...