A manufacturing company implemented a new quality control process intended to decrease defects in their products. Prior to the implementation, an average of 5.16 defects were found per shift. After the new process was implemented, an analyst at the company took a random sample of 17 shifts. In the sample, the mean number of defects was 3.1 and the standard deviation was 4.23 Conduct a hypothesis test to determine whether the mean number of defects has decreased from 5.16 per shift, at the Sigma =0.05 significance level. what is the test stastistic