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Poly(3-hydroxybutyrate) (PHB), a semicrystalline polymer that is fully biodegradable and biocompatible, is obtained from renewable resources. From a sustainability perspective, PHB offers many attractive properties though it is more expensive to produce than standard plastics. The accompanying data on melting point (°C) for each of 12 specimens of the polymer using a differential scanning calorimeter appeared in an article.
180.4 181.7 180.9 181.7 182.5 181.7
181.2 182.1 182.1 180.4 181.8 180.6
Compute the following. (Round your answer to two decimal places.)
(a)
the sample range (in °C)
2.1
Correct: Your answer is correct.
°C
(b)
the sample variance s2 from the definition [Hint: First subtract 180 from each observation.]
s2 =
2.73
Incorrect: Your answer is incorrect.
(c)
the sample standard deviation
s =
1.65
Incorrect: Your answer is incorrect.
(d)
s2 using the shortcut method
s2 =
2.73
Incorrect: Your answer is incorrect.

YOUR SOLUTION:

GIVEN:

180.4 181.7 180.9 181.7 182.5 181.7 181.2 182.1 182.1 180.4 181.8 180.6

(a). the...

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