Answer Happy

A team of health research wants to investigate whether having regular lunch break improves working adults' sleep. A group of 95 adults with a full-time job were recruited in the study, they reported average hours of sleep in the past week, committed to having a 1-hour, out-of-office, work-free lunch break each day for 3 months, and, at the end of the study, reported average hours of sleep in the past week. The mean difference in hours of sleep before and after the study was 1 with a standard deviation of 0.3. Which one of the following statements is INCORRECT? (Set alpha level at 0.05.) O The obtained test statistic is 3.249. O The degrees of freedom is 94. O The decision should be to reject the null hypothesis. O The null hypothesis is that hours of sleep remain the same before and after the study.