1:26 2 76 N & it all 42% Many employers are concerned about employees wasting time by surfing the Internet and e-mailing friends during work hou article "Who Goofs Off 2 Hours a Day? Most Workers, Survey Says" summarized data from a large sample of workers.+ Supp the CEO of a national marketing firm wants to determine the difference in mean wasted time during an 8-hour workday for of her company at two different locations. Each person in a random sample of 10 employees from Location A (population about daily wasted time at work (in minutes), and 10 employees from Location B (population 2) are asked the same question Participants were guaranteed anonymity to obtain truthful responses. Suppose the resulting data are as follows. Location A 89 141 145 100 111 142 107 116 148 81 Location B 109 106 113 114 103 104 119 115 107 102 USE SALT (a) Calculate the point estimate for the difference in the population means. 8.8 (b) Determine the margin of error for the 90% confidence interval for the difference in population means. (Use a table or to Round your answer to three decimal places.) 14.6649 (c) Find the 90% confidence interval. (Round your answers to three decimal places.) -5.84 23.44 Viewing Saved Work Revert to Last Response [2/5 Points] DETAILS PREVIOUS ANSWERS STATSQC1 16.1B.008.CH.S. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In a study of self-adhesive bandages, a doctor wanted to see if there was truly a difference in the healing time between the adhesive bandages preloaded with antibiotic and the self-adhesive bandages used with an antibiotic applied to the wound. randomly selected 100 patients to participate in the study and divided them into two groups of 50-Group 1 using the banda preloaded with antibiotic and Group 2 using the bandages with the same amount of antibiotic applied to the wound first. In the amount of time, in days, it took for the wound to heal was recorded. In Group 1, the mean healing time was 1.24 days with a standard deviation of 0.61, and the mean for Group 2 was 2.81 days standard deviation of 0.82. LA USE SALT (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 Experiment with 1 treatment: the type of antibiotic used Observational study 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 technology. Round your answer to three decimal places.) 2.628 X (c) Find the 99% confidence interval for the difference in true mean healing time in wounds between the bandages with p 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 an the bandages with antibiotic applied to the wound first is between -457 X A confidence interval is of the form Point Estimate + Margin of Error., 1.717 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 the 2 different bandages. True O False O