The effect of the time of day a psychology class is taught on test scores is being studied in an experiment. Student ability has been identified as an
extraneous factor that could also affect test scores. How can student ability
best be addressed to minimize its effect in the experiment?
A. Replication of the experiment at different times of the year
B. Randomization of students in morning and afternoon classes
C. Blocking into groups based on the teacher of the class
D. Direct control of what textbook is used
SUBMIT

Afriend of mine is giving a dinner party. his current wine supply includes 10 bottles of zinfandel, 8 of merlot, and 11 of cabernet (he only drinks red wine), all from different wineries. (a) if he wants to serve 3 bottles of zinfandel and serving order is important, how many ways are there to do this? ways (b) if 6 bottles of wine are to be randomly selected from the 29 for serving, how many ways are there to do this? ways (c) if 6 bottles are randomly selected, how many ways are there to obtain two bottles of each variety? ways (d) if 6 bottles are randomly selected, what is the probability that this results in two bottles of each variety being chosen? (round your answer to three decimal places.) (e) if 6 bottles are randomly selected, what is the probability that all of them are the same variety? (round your answer to three decimal places.)