Introduction
Essential Features of a Comparative Experiment
Experimental Design Principles
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Statistics in Data Analysis
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Showing this plot is much more informative and easier to interpret than
a long table of numbers. With this histogram we can approximate the
number of individuals in any given interval. For example, there are
approximately 42 individuals (~2.7%) with a resting heart rate greater
than 90, and another 28 individuals (~1.8%) with a resting heart rate
below 50.
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As a rule of thumb, if the ratio of the larger variance to the smaller
variance is less than 4, the groups have equal variances.
Figure 15
Code adapted from Power
Curve in R by Cinni Patel.
Figure 16
Code adapted from How
to Create Power Curves in ggplot by Levi Baguley