please do not answer if you do not know the answers. the response i recieved was incorrect and i would like to stop wasting my questions. thank you in advance

In a study of self-adhesive bandages, a doctor wanted to see if there was truly a difference in the healing time between the selfadhesive bandages preloaded with antibiotic and the self-adhesive bandages used with an antibiotic applied to the wound. The doctor randomly selected 100 patients to participate in the study and divided them into two groups of 50 -Group 1 using the bandages preloaded with antibiotic and Group 2 using the bandages with the same amount of antibiotic applied to the wound first. In both groups, the amount of time, in days, it took for the wound to heal was recorded. In Group 1, the mean healing time was 1.60 days with a standard deviation of 0.51, and the mean for Group 2 was 3.28 days with a standard deviation of 0.76. (a) Which of the following is the best way to describe this study? Experiment with 2 treatments: the bandages with antibiotic and the bandages with antibiotic applied first Observational study Experiment with 1 treatment: the type of antibiotic used Experiment with 1 treatment: the types of bandages used (b) Calculate the critical value we would use for a 99% confidence interval for difference in the population means? (Use a table or technology. Round your answer to three decimal places.) x (c) Find the 99% confidence interval for the difference in true mean healing time in wounds between the bandages with preloaded antibiotic and the bandages with antibiotic applied to the wound first. (Round your answers to two decimal places.) We can be 99% confident that the difference in true mean healing time in wounds for the bandages with preloaded antibiotic and the bandages with antibiotic applied to the wound first is between A confidence interval is of the form Point Estimate Margin of Error., A confidence interval is of the form Point Estimate Margin of Error.). (d) Determine whether the following statement is true or false. If zero lies in the interval, then there is sufficient evidence of a significant difference between the mean healing times for the 2 different bandages. True False