A cell phone company offers two plans to its subscribers. At the time, new subscribers sign up; they are asked to provide some demographic information. The mean yearly income for a sample of 40 subscribers to Plan A is $57,000 with a population standard deviation of $9,200. For a sample of 30 subscribers to Plan B, the mean income is $61,000 with a population standard deviation of $7.100. At the 0.05 significance level, is it reasonable to conclude the mean income of those selecting Plan B is larger