Analyze both replicates of the barrier disruption as a single experiment, including an indicator variable to signify replicate. Assess the significance of effects by using a pooled within-group SD to...

Analyze both replicates of the barrier disruption as a single experiment, including an indicator variable to signify replicate. Assess the significance of effects by using a pooled within-group SD to estimate !. Compare the results of this analysis with the two separate analyses in Exercises 16 and 17. What has been gained by the second replicate?