In a certain chemical process, it is very important that a particular solution that is to be used as a reactant have a pH of exactly 8.2. A method for determining pH that is available for solutions of this type is known to give measurements that are normally distributed with mean equal to the actual pH and with a standard deviation of 0.2. Suppose 10 independent measurements yielded the following pH values:
8.18, 8.16, 8.17, 8.22, 8.19, 8.17, 8.15, 8.21, 8.16, 8.18

a) What conclusion can be drawn at the alpha=0.1 level of significance?

b) what about at the alpha=0.05 level of sign

Question

In a certain chemical process, it is very important that a particular solution that is to be used as a reactant have a pH of exactly 8.2. A method for determining pH that is available for solutions of this type is known to give measurements that are normally distributed with mean equal to the actual pH and with a standard deviation of 0.2. Suppose 10 independent measurements yielded the following pH values: 
 8.18, 8.16, 8.17, 8.22, 8.19, 8.17, 8.15, 8.21, 8.16, 8.18 

 a) What conclusion can be drawn at the alpha=0.1 level of significance? 

 b) what about at the alpha=0.05 level of sign