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A researcher wishes to compare the effect of the rate of stepping on heart rate in a step-aerobics workout. A collection of 30 adult volunteers was randomly divided into three groups of 10 subjects each. Each group did a standard step-aerobics workout with group 1 at a low rate of stepping, group 2 at a medium rate of stepping, and group 3 at a high rateof stepping. The mean heart rate at the end of the workout for all subjects was determined in beats per minute. Assume the data for the three groups are independent and the data are approximately normal. An ANOVA was run on this data with the partial ANOVA table given below.
Source df Sum of squares Mean square F-ratio
Group (a) (e) (d) 5.9958
Error (b) (f) 310.867
Total (c) 12121.2
Round and answer letters "a, b, c, d, e, and f".
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