Because of the high cost of hospital stays, anything that can reduce their length and the costs of medication would be appreciated by insurance companies, hospitals, and patients. A physician researcher was searching for ways to reduce costs and decided to investigate the effect of the room the patient stayed in. She gathered data on the length of stay and the amount of pain medication (measured in morphine equivalents). Also recorded was whether the room was sunny or dim. Do these data allow the researcher to conclude that the length of stay and the amount of pain medication is lower in bright rooms than in dim ones? Conduct all tests at the 5% significance level. Use a 95% confidence level for estimates. In 2012, there were 221,963,000 Americans aged 21 years or more.