. & e - T 8. For each of the following situations, calculate the population standard error of the mean (c ) and the z-statistic (), make a decision about the null hypothesis, and indicate the level of significance. i XA=1200n=130=5 N =25 b. X =1.82; n=1.33%6=.67; N =40 X = 6.64; u=5.94;0= 1.72: N =34 4 X -76.29.n87.750=30.76; N =26 '