markthecow
02.06.2021 •
Mathematics
The following data on work of adhesion measurements (in mJ/m^2) for samples of ultra-high performance concrete adhered to two types of substrates:
Substrate Observations
Steel: 107.1 109.5 107.4 106.8 108.1
Glass: 122.4 124.6 121.6 120.6 123.3
Assuming that both samples were selected from normal distributions, carry out a test of hypotheses to decide whether the true average work of adhesion for the glass substrate is more than 12 mJ/m^2 higher than that for the steel substrate.
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Ответ:
Radius = Half the diameter
38 / 2 = 19
A = 3.14 * 19^2
A = 3.14 * 361
A = 1133.54