All of us non-smokers can rejoice - the mosaic tobacco virus that affects and injures tobacco plants is spreading!

All of us non-smokers can rejoice - the mosaic tobacco virus that affects and injures tobacco plants is spreading! Meanwhile, a tobacco company is investigating if a new treatment is effective in reducing the damage caused by the virus. Eleven plants were randomly chosen. On each plant, one leaf was randomly selected, and one half of the leaf (randomly chosen) was coated with the treatment - the other half was left untouched (control). After two weeks, the amount of damage to each half of the leaf was assessed. The output from SAS follows: VARIABLE N_USED MEAN MEDIAN SD MIN MAX 1ST: CONTROL 11 15.7273 13 9.1224 5 36 2ND: TRT 11 13.3636 12 10.0725 2 32 1ST-2ND: DIFF 11 2.36364 3 3.32484 -6 6 NORMALITY | PAIRED T | SIGN:#+ #- #0 | OBS DELETED FOR | OF DIFF | | 9 1 1 | MISSING VALUES | | W | A | 10 | .0215 | PREP1 0 | W=.8525 | T | SIGN RNK:SUM R+ R- | PREP2 0 | PR<W | PR>A | 2.358 | 45.5 9.5 | BOTH 0 | .05<P<=.10 <=.10 PR | <=".10">| PR>|T| | 2-TAIL P(TABLES) | OTHER 0 | | .0401 | .05 | TOTAL 0 | <=.10 | PRE < 0 TOTAL> <=.10 | PRE 0 TOTAL |<> What is the best reason for performing a paired experiment rather than a two- independent sample experiment? It allows us to do more experiments since we use each experimental unit twice.