Change rubric items everywhere

[VectorPosse]

I'm still seeing the old text in spots:

"When comparing two groups, comment on the effect size and the practical significance of the result."

It now should be:

"Comment on the effect size and the practical significance of the result."

(Even in a single sample group, the difference between the observed value (with CI) and the null value is still meaningful as an effect size.)

[VectorPosse]

Also, "Calculate and graph the confidence interval" isn't changed everywhere it needs to be. (See Ch, 15, for example.)