A researcher wished to compare the effect of the frequency of the rate of stepping on heart rate in a step-aerobics workout. A collection of 30 adult volunteers, 15 women and 15 men, was selected from a local gym. The men were randomly divided into three groups of five 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 rapid rate. The women were also randomly divided into three groups of five subjects each. As with the men, each group did one of the three standard step-aerobics workouts. The mean heart rate at the end of the workout for all subjects was determined (in beats per minute) . A partial ANOVA table for these data is given below. Analysis of variance for heart rate: 
Which test was used to explore this problem?
Definitions:
Genetically Determined
Traits or characteristics that are influenced by genes inherited from one's parents.
Phenotype
The set of observable characteristics or traits of an organism, resulting from the interaction of its genotype with the environment.
Hereditary Traits
Characteristics or attributes that are passed from one generation to the next through genetic information.
Polyphenisms
The occurrence of two or more distinct phenotypes within a single species, depending on environmental conditions, without genetic differences.
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