Plastic Microfiber Pollution from Clothes Plastic microparticles are contaminating the world's shorelines, and much of this pollution appears to come from fibers from washing polyester clothes. The worst offender appears to be fleece, and a recent study found that the mean number of polyester fibers discharged into wastewater from washing fleece was 290 fibers per liter of wastewater, with a standard deviation of 87.6 and a sample size of 120. Browne, M., et. al., "Accumulation of Microplastic on Shorelines Worldwide: Sources and Sinks," Environmental Science and Technology, 2011; 45: 9175-9179. Data are approximated from information given. X Your answer is incorrect. (a) Find a 99% confidence interval for the mean number of polyester microfibers per liter of wastewater when washing fleece. Round your answers to one decimal place. The 99% confidence interval is to eTextbook and Media HintI Your answer is incorrect. (b) What is the margin of error? Round your answer to one decimal place. margin of error = I I eTextbook and Media Hint X Your answer is incorrect. (c) If we want a margin of error of only +6 with 99% confidence, what sample size is needed? Round your answer up to the nearest integer. sample size = eTextbook and Media Hint