4. 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 8.20. A method for determining pH that is available 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 .02. Suppose 10 independent measurements yielded the following pH values:

(a) What conclusion can be drawn at the α = .10 level of significance?

(b) What about at the α = .05 level of significance?

Transcribed Image Text:

8.18 8.17 8.16 8.15 8.17 8.21 8.22 8.16 8.19 8.18