15. Study the following calculations: Ho: u = 25 HA: u at 25 Y: 28.1 0 = 8.46 n = 57 a = .01 (sz = $2.58) In conducting a z-test to determine whether there is a statistically significant difference between the sample mean and the population mean, you calculate zobs = 2.77. What do you do? J O a.Accept HO O b. Reject H0 16. Study the following calculations: Ho: u = 1200 HA: u >1200 Y=1215 o: 100 n=113 a = .05 (2m = 1.65) In conducting a z-test to determine whether there is a statistically significant difference between the sample mean and the population mean, you calculate zobs = 1 .59. What do you do? O a. Accept Hg l O b. Reject H0 17. Study the following calculations: The population is normally distributed H0: u = 16 HA: u i 16 7: 16.45 s = 3.59 n=20(df=n1) o = .05 In conducting a one-sample t-test to determine whether there is a statistically signicant difference between the sample mean and the population mean, you calculate tabs = 0.56. What do you do? J O a.Accept HO O b. Reject H0 18. Study the following calculations: The population is normally distributed Ho: p = 1160 HA: p > 1160 Y: 1236.36 3:103.81 n=11(df=n1) 01:05 In conducting a one-sample ttest to determine whether there is a statistically signicant difference between the sample mean and the population mean, you calculate tobs = 2.44. What do you do? 0 a.Accept HO O b. Reject H0 19. Study the following calculations: The population is normally distributed Ho: H1 - H2= 0 HA: H1 - H2 0 n = 9 pairs of data d = - 7.11 Sa = 6.45 a = .01 (df = n pairs - 1) In conducting a paired-samples t-test to determine whether there is a statistically significant difference between the two samples, you calculate tobs = 3.31. What do you do? O a. Accept Ho O b. Reject Ho22. Study the following calculations: The population is normally distributed Ho: D = 0 HA: D 7 0 n = 11 pairs of data d = - 28.09 Sd = 25.81 a = .02 (df = n pairs - 1) In conducting a paired-samples t-test to determine whether there is a statistically significant difference between the two samples, you calculate tobs = - 3.61. What do you do? O a. Accept Ho O b. Reject Ho