Just wanna double check my answer. Answer only. thanks

A large laboratory has four types of devices to determine the ph of soil samples. The lab uses 24 soil samples having known ph in a study and randomly assigns six samples to each device. The samples are tested, and the response recorded for each sample is the difference between the pH reading of the device and the known pH of the soil. Summary statistics from the study are given below. Device A B C D Mean -0.1605 0.0947 0.1227 0.2735 SST=1.386644 SST/=0.5837482 Use this information to answer questions 1-5. The mean squared error (MSE) is O a. (1.386644-0.5837482)/24. O b. (1.386644-0.5837482)/20. c. 1.386644/20. O d. 1.386644/24. e. 0.5837482/24.Assuming that the variances for different devices are the same, the standard deviation of observations for Device A is estimated by O a. 0.1605+0.08258333. O b. MSTr. O C. MSE. O d. (MSE) 1/2 O e. (MSTr) 1/2rejected when the F-statistic is Suppose we wish to test the hypothesis that the average ph measurements are the same for all four devices. If the test is to be conducted at the 0.05 level of significance, then the hypothesis of equal means is O a. at least 2.87. O b. less than 2.87. O c. at least 3. 10. d. less than 3.10. O e. at least 3.96.The value of the F-statistic for comparing the means is a. 0. 1459371/MSE. O b. 0. 1945827/MSE. O c. (0.2735+0.1605)~/MSE. d. 1.386644/0.5837482. e. 0.5837482/1.386644