Recall the afl-cio press release from a previous activity. "fewer than half of wal-mart workers are insured under the company plan—just 46 percent. this rate is dramatically lower than the 66 percent of workers at large private firms who are insured under their companies’ plans, according to a new commonwealth fund study released today, which documents the growing trend among large employers to drop health insurance for their workers." what are the smallest sample sizes that allow us to use a normal model in this situation?