A certain math class used to have a pass rate of 85% in any given semester. After a course redesign, the course coordinator claims the pass rate is now different. Based on a simple random sample of 200 students from the redesigned math class, 155 students passed the math course. At the 10% level of significance, is there sufficient evidence to support the course coordinator's claim?
Step 2 of 4: Calculate the test statistic. Round your answer to two decimal places.