When tested for compliance with Sarbanes-Oxley requirements for financial records and fraud protection, 14 of 180 publicly traded business services companies failed, compared with 7 of 67 computer...

When tested for compliance with Sarbanes-Oxley requirements for financial records and fraud protection, 14 of 180 publicly traded business services companies failed, compared with 7 of 67 computer hardware, software and telecommunications companies. (a) Is this a statistically significant difference at α = .05? (b) Can normality be assumed? (Data are from The New York Times, April 27, 2005, p. BU5.).