in a certain chemical process, a particular solution that is to be used as a reactant is supposed to have a ph of exactly 8.20. a method for determining ph for solutions of this type is known to give measurements that are normally distributed with a mean equal to the actual ph and with a standard deviation of 0.02. suppose 10 independent measurements yielded the following ph values: 8.18, 8.23, 8.16, 8.15, 8.17, 8.21, 8.22, 8.16, 8.19, 8.18. what conclusion can be drawn at the significance level 0.01?