Researchers at the University of California, San Diego conducted an experiment that studied the sleep of 164 American adults. The researchers used a device called a polysomnography machine to document slow-wave sleep, which is thought to be the most restorative period of sleep very important to good health. Generally, people are thought to spend 20 percent of their night in slow-wave sleep. The percentage of slow-wave sleep each individual experienced was recorded as was the race of the participants in the study. Can we infer that White American adults get more slow-wave sleep than Black American adults?