Based on last week's report, the average number of processed documents per hour was 15.11, with a standard deviation of XXXXXXXXXXThat is, one document was reviewed in XXXXXXXXXXseconds. To be...

Based on last week's report, the average number of processed documents per hour was 15.11, with a standard deviation of 2.666. That is, one document was reviewed in 238.25 seconds. To be objective as much as possible, the manager spoke with an employee whose average was exactly 15 documents per hour. The employee claimed that if she was given a larger monitor, the processing time would be shorter. They conducted an experiment with a large monitor and measured processing time. After reviewing 20 documents, the calculated average processing time per document was 190.58 seconds. The manager believes that a bigger monitor helped reduce the processing time for reviewing foreclosure documents. Conduct a hypothesis test using a 95% confidence level, which means that significance level a = 0.05. Construct a bell-shaped diagram showing the critical value and the calculated test statistic.