=+15.10 It has been reported that varying work schedules can lead to a variety of health problems for workers. The article “Nutrient Intake in Day Workers and Shift Workers” (Work and Stress [1994]: 332–342) reported on blood glucose levels (mmol/L) for day-shift workers and workers on two different types of rotating shifts. The sample sizes were n1 5 37 for the day shift, n2 5 34 for the second shift, and n3 5 25 for the third shift. A single-factor ANOVA resulted in F 5 3.834. At a significance level of

.05, does true average blood glucose level appear to depend on the type of shift?