A consulting firm had predicted that 29% of the employees at a large firm would take advantage of a new company Credit Union, but management is skeptical. They doubt the rate is that high. A survey of 400 employees shows that 168 of them are currently taking advantage of the Credit Union. a) Find the standard deviation of the sample proportion based on the null hypothesis. b) Find the z-statistic. c) Does the z-statistic seem like a particularly large or small value?