Suppose a random sample of 100 U.S. companies taken in 2005 showed that 21 offered high-deductible health insurance plans to their workers. A separate random sample of 120 firms taken in 2006 showed that 30 offered high- deductible health insurance plans to their workers. Based on the sample results, can you conclude that there was a higher proportion of U.S. companies offering high-deductible health insurance plans to their workers in 2006 than in 2005 at a 5% level of significance.