Table 3 shows the observations for y and z and their corresponding deviations from the sample means. Table 3 yi Zi Vi - y Zi - Z 5 1 1 -4 2 6 -2 1 5 8 3 The sample covariance between y and z is The sample correlation coefficient between y and z is Table 4 shows the observations for x and z and their corresponding deviations from the sample means