A particular pharmaceutical contract company is responsible for sending over statistical reports, graphs and various other submissions to the contracted pharmaceutical company. The company claims that they only produced a total of 3 errors per report. An external auditor feels like this is perhaps a very low number and questions the claim. The auditor decides to investigate. She finds that the mean number of errors in a sample of 100 submissions was 4 with a standard deviation of Can the auditor suggest that the company is falsely presenting information?

a. Hypothesis Test Method

b. Confidence Interval Method