An experimental surgical procedure is being studied as an alternative to the old method. Both methods are considered safe. Five surgeons perform the operation on two patients matched by age, sex, and other relevant factors, with the results shown. The time to complete the surgery (in minutes) is recorded. Click here for the Excel Data File (a-1) Calculate the difference between the new and the old ways for the data given below. Use a=100. (Negative values should be indicated by a minus sign.) (a-2) Calculate the mean and standard deviation for the difference. (Round your mean answer to 1 decimal place and standard deviation answer to 4 decimal places.) (a-3) Choose the right option for H0:d0;H1:d>0. Reject if t1.533206274 (a-4) Calculate the value of tcalc. (Round your answer to 4 decimal places.) (b-1) Is the decision close? (Round your answer to 4 decimal places.)