A group of scientists studied the adhesion of various biofilms to solid surfaces for possible use in environmental technologies. Adhesion assay is conducted by measuring absorbance at A590. If the...

A group of scientists studied the adhesion of various biofilms to solid surfaces for possible use in environmental technologies. Adhesion assay is conducted by measuring absorbance at A590. If the scientists want the confidence interval to beno wider than 0.55 dyne-cm2 at 99% confidence interval, how manyobservations should they take? Assume that the standard deviation is known to be 0.66 dyne-cm².