1T points 16.E.027 My Notes Ask Your Sulfur compounds cause \"off-odors\" in win

Question

1T points 16.E.027 My Notes Ask Your 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 (?m. The untrained noses of consumers may be less sensitive, however. Here are the DMS odor thresholds for 10 untrained students. 31 31443921 33 33 30 2124 (a) Assume that the standard deviation of the odor threshold for untrained noses is known to be ?-9 ??. Briefly discuss the other two-simple conditions," using a stemplot to verify that the distribution is roughly symmetric with no outiers. (Enter you NONE in any unused answer blanks.) r answers from smallest to largest. Enter StemsLeaves threshold among all students. (Round your answers to two (b) Following the four-step process, give a 95% confidence interval for the mean DMS odor eBook Notes O Ask Your 7 16.E.028. 14 sample on the margin or emor of a 95% an dence inter vat Statisticians prefer large samples, Describe briefly the effect of increasing the size of a O The margin of error willincrease. The margin of error will decrease. The margin of error will stay the same. 18

Explanation / Answer

a)

b)
mean = 30.7 , std.dev= 7.3794

t value at 95% = 2.2622

CI = mean +/- t * (s/sqrt(n))
= 30.7 +/- 2.2622 * (7.3794/sqrt(10))
= (25.4209,35.9790)

(25.42 to 35.98)

stems leaves 2 1    1 2 4 3 0 3 1     1    3    3     9 4 4

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