A researcher wants to know how long it takes, on average, for a certain species of bacteria to divide. She watches 18 cells through a microscope and times how long it takes them to divide. She obtains the following data, in hours: 7.2, 6.4, 10, 7.2, 6.7, 4.7, 5.8, 9.6, 9.2, 5, 7.6, 5, 11.5, 6.6, 3.2, 8.7, 6.9, 7 Assuming the population standard deviation is o - 1.6, construct a 97% confidence interval for the average time it takes this species of bacteria to divide. ac N Q Za Margin of Error: E We are 97% confident that this species of bacteria takes, on average, between hours and hours to divide