Question

(18.42) Sulfur compounds cause "off-odors" in wine, so winemakers want to know the odor threshold, the lowest concentration of a compound that the human nose can detect. The odor threshold for dimethyl sulfide (DMS) in trained wine tasters is about 25 micrograms per liter of wine (μμg/ l). The untrained noses of consumers may be less sensitive, however. You want to estimate the mean DMS odor threshold among all students, and you would be satisfied to estimate the mean to within ±±0.1 with 95 % confidence. The standard deviation of the odor threshold for untrained noses is known to be σσ = 6 micrograms per liter of wine. How large an SRS of untrained students do you need? ___

          (18.42) Sulfur compounds cause "off-odors" in wine, so
winemakers want to know the odor threshold, the lowest
concentration of a compound that the human nose can detect. The
odor threshold for dimethyl sulfide (DMS) in trained wine tasters
is about 25 micrograms per liter of wine (μμg/ l). The untrained
noses of consumers may be less sensitive, however.
You want to estimate the mean DMS odor threshold among all
students, and you would be satisfied to estimate the mean to
within ±±0.1 with 95 % confidence.
The standard deviation of the odor threshold for untrained noses
is known to be σσ = 6 micrograms per liter of wine.
How large an SRS of untrained students do you need? ___

Added by Joaquin W.

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