The preliminary Acorn Course Description contained:
(page 7) II.C Planning and conducting experiments. 1. Randomized comparative experiments a. Reducing the effect of uncontrolled factors b. Measuring experimental error 2. Blocking to reduce variation
The latest course description contains:
(page 6) II.C. Planning and conducting experiments. 1. Experiments versus observational studies versus surveys 2. Confounding, control groups, placebo effects, blinding 3. Treatments, experimental units, and randomization 4. Completely randomized design for two treatments 5. Randomized paired comparison design 6. Replication, blocking, and generalizability of results
----- End of forwarded message from Joe H Ward -----
This is just my two cents, but I see the new list as a clarification rather than an expansion of the old one. I also think it is important to note that there is no sign of any TECHNIQUES from a Design of Experiments course moving into AP Stats. There are some CONCEPTS, but these are concepts underlying techniques already included. In other words, another way to look at the changes is as an attempt to be more explicit about wanting to teach the underlying concepts, even when cookbooks do not mention them (so the Acorn book had to).
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