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: 9.2, 7.7, 8.4, 7.6, 7.7, 7.8, 8.7, 7.6, 8.9, 7.3, 7.1, 7.8, 9.1, 7, 8.1, 8.6, 7.1, 8.1 Assuming the population standard deviation is o = 0.7, construct a 99% confidence interval for the average time it takes this species of bacteria to divide. T= N Q za Margin of Error: E We are 9% confident that this species of bacteria takes, on average, between hours and hours to divide