18.42 this wine stinks. how sensitive are the untrained
noses of students? exercise 16.27 (page 390) gives the
lowest levels of dimethyl sulfide (dms) that 10 students
could detect. you want to estimate the mean dms odor
threshold among all students and you would be satis-
fied to estimate the mean to within 0.1 with 99%
confidence. the standard deviation of the odor thresh-
old for untrained noses is known to be o = 7 micro-
grams per liter of wine. how large an srs of untrained
students do you need?
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