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: The pooled standard error is:
A)15.5.
B)75.9.
C)240.1.
D)5762.

Question

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:  The pooled standard error is:
A)15.5. 
B)75.9. 
C)240.1. 
D)5762.

Quizplus · Accepted Answer

The pooled standard error is found in the "Mean Square" column of the ANOVA table, and is the average of the within-group variances. In this case, it is 15.5.

A Researcher Wished to Compare the Effect of the Frequency